diff --git a/Source/AppScaffolding/LibationScaffolding.cs b/Source/AppScaffolding/LibationScaffolding.cs
index 9a0b385d..57b86ec8 100644
--- a/Source/AppScaffolding/LibationScaffolding.cs
+++ b/Source/AppScaffolding/LibationScaffolding.cs
@@ -90,6 +90,7 @@ namespace AppScaffolding
 			Migrations.migrate_to_v6_6_9(config);
             Migrations.migrate_to_v11_5_0(config);
 			Migrations.migrate_to_v11_6_5(config);
+			Migrations.migrate_to_v12_0_1(config);
 		}
 
 		/// <summary>Initialize logging. Wire-up events. Run after migration</summary>
@@ -417,6 +418,82 @@ namespace AppScaffolding
             public List<string> Filters { get; set; } = new();
         }
 
+
+		public static void migrate_to_v12_0_1(Configuration config)
+		{
+#nullable enable
+			//Migrate from version 1 file cache to the dictionary-based version 2 cache
+			const string FILENAME_V1 = "FileLocations.json";
+			const string FILENAME_V2 = "FileLocationsV2.json";
+
+			var jsonFileV1 = Path.Combine(Configuration.Instance.LibationFiles, FILENAME_V1);
+			var jsonFileV2 = Path.Combine(Configuration.Instance.LibationFiles, FILENAME_V2);
+
+			if (!File.Exists(jsonFileV2) && File.Exists(jsonFileV1))
+			{
+				try
+				{
+					//FilePathCache loads the cache in its static constructor,
+					//so perform migration without using FilePathCache.CacheEntry
+					if (JArray.Parse(File.ReadAllText(jsonFileV1)) is not JArray v1Cache || v1Cache.Count == 0)
+						return;
+
+					Dictionary<string, JArray> cache = new();
+
+					//Convert to c# objects to speed up searching by ID inside the iterator 
+					var allItems
+						= v1Cache
+						.Select(i => new
+						{
+							Id = i["Id"]?.Value<string>(),
+							Path = i["Path"]?["Path"]?.Value<string>()
+						}).Where(i => i.Id != null)
+						.ToArray();
+
+					foreach (var id in allItems.Select(i => i.Id).OfType<string>().Distinct())
+					{
+						//Use this opportunity to purge non-existent files and re-classify file types
+						//(due to *.aax files previously not being classified as FileType.AAXC)
+						var items = allItems
+							.Where(i => i.Id == id && File.Exists(i.Path))
+							.Select(i => new JObject
+							{
+								{ "Id", i.Id },
+								{ "FileType", (int)FileTypes.GetFileTypeFromPath(i.Path) },
+								{ "Path", new JObject{ { "Path", i.Path } } }
+							})
+							.ToArray();
+
+						if (items.Length == 0)
+							continue;
+
+						cache[id] = new JArray(items);
+					}
+
+					var cacheJson = new JObject { { "Dictionary", JObject.FromObject(cache) } };
+					var cacheFileText = cacheJson.ToString(Formatting.Indented);
+
+					void migrate()
+					{
+						File.WriteAllText(jsonFileV2, cacheFileText);
+						File.Delete(jsonFileV1);
+					}
+
+					try { migrate(); }
+					catch (IOException)
+					{
+						try { migrate(); }
+						catch (IOException)
+						{
+							migrate();
+						}
+					}
+				}
+				catch { /* eat */ }
+			}
+#nullable restore
+		}
+
 		public static void migrate_to_v11_6_5(Configuration config)
 		{
 			//Settings migration for unsupported sample rates (#1116)
diff --git a/Source/ApplicationServices/LibraryExporter.cs b/Source/ApplicationServices/LibraryExporter.cs
index c1f84769..e2373e53 100644
--- a/Source/ApplicationServices/LibraryExporter.cs
+++ b/Source/ApplicationServices/LibraryExporter.cs
@@ -144,7 +144,7 @@ namespace ApplicationServices
 				PictureId = a.Book.PictureId,
 				IsAbridged = a.Book.IsAbridged,
 				DatePublished = a.Book.DatePublished,
-				CategoriesNames = a.Book.LowestCategoryNames().Any() ? a.Book.LowestCategoryNames().Aggregate((a, b) => $"{a}, {b}") : "",
+				CategoriesNames = string.Join("; ", a.Book.LowestCategoryNames()),
 				MyRatingOverall = a.Book.UserDefinedItem.Rating.OverallRating,
 				MyRatingPerformance = a.Book.UserDefinedItem.Rating.PerformanceRating,
 				MyRatingStory = a.Book.UserDefinedItem.Rating.StoryRating,
diff --git a/Source/LibationAvalonia/App.axaml b/Source/LibationAvalonia/App.axaml
index 5ba253c0..e61e851a 100644
--- a/Source/LibationAvalonia/App.axaml
+++ b/Source/LibationAvalonia/App.axaml
@@ -2,6 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:local="using:LibationAvalonia"
              xmlns:controls="using:LibationAvalonia.Controls"
+             xmlns:dialogs="using:LibationAvalonia.Dialogs"
 			 x:Class="LibationAvalonia.App"
              Name="Libation">
 
@@ -12,6 +13,10 @@
 	<Application.Resources>
 
 		<ResourceDictionary>
+			<ControlTheme x:Key="{x:Type TextBlock}" TargetType="TextBlock">
+				<Setter Property="Foreground" Value="{DynamicResource TextControlForeground}" />
+				<Setter Property="Background" Value="Transparent" />
+			</ControlTheme>
 			<ResourceDictionary.ThemeDictionaries>
 				<ResourceDictionary x:Key="Light">
 					<SolidColorBrush x:Key="SeriesEntryGridBackgroundBrush" Opacity="0.3" Color="#abffab" />
@@ -81,6 +86,60 @@
 			<!-- It's called AutoHide, but this is really the mouseover shrink/expand. -->
             <Setter Property="AllowAutoHide" Value="false"/>
 		</Style>
+
+		<Style Selector="dialogs|DialogWindow">
+			<Style Selector="^[UseCustomTitleBar=false]">
+				<Setter Property="SystemDecorations" Value="Full"/>
+				<Setter Property="Template">
+					<ControlTemplate>
+						<ContentPresenter Background="{DynamicResource SystemControlBackgroundAltHighBrush}" Content="{TemplateBinding Content}" />
+					</ControlTemplate>
+				</Setter>
+			</Style>
+			<Style Selector="^[UseCustomTitleBar=true]">
+				<Setter Property="SystemDecorations" Value="BorderOnly"/>
+				<Setter Property="Template">
+					<ControlTemplate>
+						<Panel Background="{DynamicResource SystemControlBackgroundAltHighBrush}">
+							<Grid RowDefinitions="30,*">
+								<Border Name="DialogWindowTitleBorder" Margin="5,0" Background="{DynamicResource SystemAltMediumColor}">
+									<Border.Styles>
+										<Style Selector="Button#DialogCloseButton">
+											<Style Selector="^:pointerover">
+												<Style Selector="^ /template/ ContentPresenter#PART_ContentPresenter">
+													<Setter Property="Background" Value="Red" />
+												</Style>
+												<Style Selector="^ Path">
+													<Setter Property="Fill" Value="{DynamicResource IconFill}" />
+												</Style>
+											</Style>
+											<Style Selector="^:not(:pointerover) /template/ ContentPresenter#PART_ContentPresenter">
+												<Setter Property="Background" Value="Transparent" />
+												<Setter Property="BorderBrush" Value="Transparent" />
+											</Style>
+										</Style>
+									</Border.Styles>
+								
+									<Grid ColumnDefinitions="Auto,*,Auto">
+
+										<Path Name="DialogWindowTitleIcon" Margin="3,5,0,5" Fill="{DynamicResource IconFill}" Stretch="Uniform"  Data="{StaticResource LibationGlassIcon}"/>
+									
+										<TextBlock Name="DialogWindowTitleTextBlock" Margin="8,0,0,0" VerticalAlignment="Center" FontWeight="DemiBold" FontSize="12" Grid.Column="1" Text="{TemplateBinding Title}" />
+
+										<Button Name="DialogCloseButton" Grid.Column="2">
+											<Path Fill="{DynamicResource SystemControlBackgroundBaseLowBrush}" VerticalAlignment="Center" Stretch="Uniform" RenderTransform="{StaticResource Rotate45Transform}" Data="{StaticResource CancelButtonIcon}" />
+										</Button>
+									</Grid>
+								</Border>
+								<Path Stroke="{DynamicResource SystemBaseMediumLowColor}" StrokeThickness="1" VerticalAlignment="Bottom" Stretch="Fill" Data="M0,0 L1,0" />
+								<ContentPresenter Grid.Row="1" Content="{TemplateBinding Content}" />
+							</Grid>
+						</Panel>
+					</ControlTemplate>
+				</Setter>
+			</Style>
+		</Style>
+		
 	</Application.Styles>
 
 	<NativeMenu.Menu>
diff --git a/Source/LibationAvalonia/App.axaml.cs b/Source/LibationAvalonia/App.axaml.cs
index 70b091d6..55e2a137 100644
--- a/Source/LibationAvalonia/App.axaml.cs
+++ b/Source/LibationAvalonia/App.axaml.cs
@@ -44,7 +44,7 @@ namespace LibationAvalonia
 
 				if (!config.LibationSettingsAreValid)
 				{
-					var defaultLibationFilesDir = Configuration.UserProfile;
+					var defaultLibationFilesDir = Configuration.DefaultLibationFilesDirectory;
 
 					// check for existing settings in default location
 					var defaultSettingsFile = Path.Combine(defaultLibationFilesDir, "Settings.json");
@@ -82,8 +82,8 @@ namespace LibationAvalonia
 				// - error message, Exit()				
 				if (setupDialog.IsNewUser)
 				{
-					Configuration.SetLibationFiles(Configuration.UserProfile);
-					setupDialog.Config.Books = Path.Combine(Configuration.UserProfile, nameof(Configuration.Books));
+					Configuration.SetLibationFiles(Configuration.DefaultLibationFilesDirectory);
+					setupDialog.Config.Books = Configuration.DefaultBooksDirectory;
 
 					if (setupDialog.Config.LibationSettingsAreValid)
 					{
@@ -174,7 +174,7 @@ namespace LibationAvalonia
 
 				if (continueResult == DialogResult.Yes)
 				{
-					config.Books = Path.Combine(libationFilesDialog.SelectedDirectory, nameof(Configuration.Books));
+					config.Books = Configuration.DefaultBooksDirectory;
 
 					if (config.LibationSettingsAreValid)
 					{
diff --git a/Source/LibationAvalonia/Assets/LibationVectorIcons.xaml b/Source/LibationAvalonia/Assets/LibationVectorIcons.xaml
index 9c9d7ec2..095307ae 100644
--- a/Source/LibationAvalonia/Assets/LibationVectorIcons.xaml
+++ b/Source/LibationAvalonia/Assets/LibationVectorIcons.xaml
@@ -91,6 +91,32 @@
 		   S 192,128 147,147
 	   </StreamGeometry>
 	   
+	   <StreamGeometry  x:Key="LibationGlassIcon">
+		   M262,8
+		   h-117
+		   a 192,200 0 0 0 -36,82
+		   a 222,334 41 0 0 138,236
+		   v158
+		   h-81
+		   a 16,16 0 0 0 0,32
+		   h192
+		   a 16 16 0 0 0 0,-32
+		   h-81
+		   v-158
+		   a 222,334 -41 0 0 138,-236
+		   a 192,200 0 0 0 -36,-82
+		   h-117
+		   m-99,30
+		   a 192,200 0 0 0 -26,95
+		   a 187.5,334 35 0 0 125,159
+		   a 187.5,334 -35 0 0 125,-159
+		   a 192,200 0 0 0 -26,-95
+		   h-198
+		   M158,136
+		   a 168,305 35 0 0 104,136
+		   a 168,305 -35 0 0 104,-136
+	   </StreamGeometry>
+	   
    </ResourceDictionary>
   </Styles.Resources>
 </Styles>
diff --git a/Source/LibationAvalonia/Controls/DirectorySelectControl.axaml.cs b/Source/LibationAvalonia/Controls/DirectorySelectControl.axaml.cs
index 1f8b02ab..65933290 100644
--- a/Source/LibationAvalonia/Controls/DirectorySelectControl.axaml.cs
+++ b/Source/LibationAvalonia/Controls/DirectorySelectControl.axaml.cs
@@ -51,7 +51,9 @@ namespace LibationAvalonia.Controls
 			{
 				Configuration.KnownDirectories.WinTemp,
 				Configuration.KnownDirectories.UserProfile,
+				Configuration.KnownDirectories.ApplicationData,
 				Configuration.KnownDirectories.AppDir,
+				Configuration.KnownDirectories.MyMusic,
 				Configuration.KnownDirectories.MyDocs,
 				Configuration.KnownDirectories.LibationFiles
 			};
diff --git a/Source/LibationAvalonia/Controls/Settings/Important.axaml b/Source/LibationAvalonia/Controls/Settings/Important.axaml
index 9f77b898..6653b82a 100644
--- a/Source/LibationAvalonia/Controls/Settings/Important.axaml
+++ b/Source/LibationAvalonia/Controls/Settings/Important.axaml
@@ -166,16 +166,7 @@
 				MinWidth="80"
 				SelectedItem="{CompiledBinding ThemeVariant, Mode=TwoWay}"
 				ItemsSource="{CompiledBinding Themes}"/>
-
-			<TextBlock
-				Grid.Column="2"
-				FontSize="16"
-				FontWeight="Bold"
-				Margin="10,0"
-				VerticalAlignment="Center"
-				IsVisible="{CompiledBinding	SelectionChanged}"
-				Text="Theme change takes effect on restart"/>
-
+			
 		</Grid>
 	</Grid>
 </UserControl>
diff --git a/Source/LibationAvalonia/Dialogs/DialogWindow.cs b/Source/LibationAvalonia/Dialogs/DialogWindow.cs
index e6213841..38dcd109 100644
--- a/Source/LibationAvalonia/Dialogs/DialogWindow.cs
+++ b/Source/LibationAvalonia/Dialogs/DialogWindow.cs
@@ -1,4 +1,6 @@
-using Avalonia.Controls;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
 using LibationFileManager;
 using System;
 using System.Threading.Tasks;
@@ -9,19 +11,98 @@ namespace LibationAvalonia.Dialogs
 	{
 		public bool SaveAndRestorePosition { get; set; } = true;
 		public Control ControlToFocusOnShow { get; set; }
+		protected override Type StyleKeyOverride => typeof(DialogWindow);
+
+		public static readonly StyledProperty<bool> UseCustomTitleBarProperty =
+		AvaloniaProperty.Register<DialogWindow, bool>(nameof(UseCustomTitleBar));
+
+		public bool UseCustomTitleBar
+		{
+			get { return GetValue(UseCustomTitleBarProperty); }
+			set { SetValue(UseCustomTitleBarProperty, value); }
+		}
+
 		public DialogWindow()
 		{
-			this.HideMinMaxBtns();
-			this.KeyDown += DialogWindow_KeyDown;
-			this.Initialized += DialogWindow_Initialized;
-			this.Opened += DialogWindow_Opened;
-			this.Closing += DialogWindow_Closing;
+			KeyDown += DialogWindow_KeyDown;
+			Initialized += DialogWindow_Initialized;
+			Opened += DialogWindow_Opened;
+			Closing += DialogWindow_Closing;
+
+			UseCustomTitleBar = Configuration.IsWindows;
 		}
+
+		private bool fixedMinHeight = false;
+		private bool fixedMaxHeight = false;
+		private bool fixedHeight = false;
+
+		protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+		{
+			const int customTitleBarHeight = 30;
+			if (UseCustomTitleBar)
+			{
+				if (change.Property == MinHeightProperty && !fixedMinHeight)
+				{
+					fixedMinHeight = true;
+					MinHeight += customTitleBarHeight;
+					fixedMinHeight = false;
+				}
+				if (change.Property == MaxHeightProperty && !fixedMaxHeight)
+				{
+					fixedMaxHeight = true;
+					MaxHeight += customTitleBarHeight;
+					fixedMaxHeight = false;
+				}
+				if (change.Property == HeightProperty && !fixedHeight)
+				{
+					fixedHeight = true;
+					Height += customTitleBarHeight;
+					fixedHeight = false;
+				}
+			}
+			base.OnPropertyChanged(change);
+		}
+
 		public DialogWindow(bool saveAndRestorePosition) : this()
 		{
 			SaveAndRestorePosition = saveAndRestorePosition;
 		}
 
+		protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+		{
+			base.OnApplyTemplate(e);
+
+			if (!UseCustomTitleBar)
+				return;
+
+			var closeButton = e.NameScope.Find<Button>("DialogCloseButton");
+			var border = e.NameScope.Get<Border>("DialogWindowTitleBorder");
+			var titleBlock = e.NameScope.Get<TextBlock>("DialogWindowTitleTextBlock");
+			var icon = e.NameScope.Get<Avalonia.Controls.Shapes.Path>("DialogWindowTitleIcon");
+
+			closeButton.Click += CloseButton_Click;
+			border.PointerPressed += Border_PointerPressed;
+			icon.IsVisible = Icon != null;
+
+			if (MinHeight == MaxHeight && MinWidth == MaxWidth)
+			{
+				CanResize = false;
+				border.Margin = new Thickness(0);
+				icon.Margin = new Thickness(8, 5, 0, 5);
+			}
+		}
+
+		private void Border_PointerPressed(object sender, Avalonia.Input.PointerPressedEventArgs e)
+		{
+			if (e.GetCurrentPoint(null).Properties.IsLeftButtonPressed)
+				BeginMoveDrag(e);
+		}
+
+		private void CloseButton_Click(object sender, Avalonia.Interactivity.RoutedEventArgs e)
+		{
+			CancelAndClose();
+		}
+
 		private void DialogWindow_Initialized(object sender, EventArgs e)
 		{
 			this.WindowStartupLocation = WindowStartupLocation.CenterOwner;
diff --git a/Source/LibationAvalonia/Dialogs/ScanAccountsDialog.axaml.cs b/Source/LibationAvalonia/Dialogs/ScanAccountsDialog.axaml.cs
index df5c5b4d..912f2c0d 100644
--- a/Source/LibationAvalonia/Dialogs/ScanAccountsDialog.axaml.cs
+++ b/Source/LibationAvalonia/Dialogs/ScanAccountsDialog.axaml.cs
@@ -25,7 +25,6 @@ namespace LibationAvalonia.Dialogs
 		{
 			InitializeComponent();
 
-			this.HideMinMaxBtns();
 			ControlToFocusOnShow = this.FindControl<Button>(nameof(ImportButton));
 
 			LoadAccounts();
diff --git a/Source/LibationAvalonia/Dialogs/SearchSyntaxDialog.axaml.cs b/Source/LibationAvalonia/Dialogs/SearchSyntaxDialog.axaml.cs
index 07ca798f..115ab2cc 100644
--- a/Source/LibationAvalonia/Dialogs/SearchSyntaxDialog.axaml.cs
+++ b/Source/LibationAvalonia/Dialogs/SearchSyntaxDialog.axaml.cs
@@ -12,8 +12,6 @@ namespace LibationAvalonia.Dialogs
 		{
 			InitializeComponent();
 
-			this.HideMinMaxBtns();
-
 			StringFields = @"
 Search for wizard of oz:
      title:oz
diff --git a/Source/LibationAvalonia/FormSaveExtension.cs b/Source/LibationAvalonia/FormSaveExtension.cs
index 0a9f0123..f0e239f5 100644
--- a/Source/LibationAvalonia/FormSaveExtension.cs
+++ b/Source/LibationAvalonia/FormSaveExtension.cs
@@ -109,23 +109,5 @@ namespace LibationAvalonia
 			public int Width;
 			public bool IsMaximized;
 		}
-
-		public static void HideMinMaxBtns(this Window form)
-		{
-			if (Design.IsDesignMode || !Configuration.IsWindows || form.TryGetPlatformHandle() is not IPlatformHandle handle)
-				return;
-
-			var currentStyle = GetWindowLong(handle.Handle, GWL_STYLE);
-
-			SetWindowLong(handle.Handle, GWL_STYLE, currentStyle & ~WS_MAXIMIZEBOX & ~WS_MINIMIZEBOX);
-		}
-
-		const long WS_MINIMIZEBOX = 0x00020000L;
-		const long WS_MAXIMIZEBOX = 0x10000L;
-		const int GWL_STYLE = -16;
-		[System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "GetWindowLong")]
-		static extern long GetWindowLong(IntPtr hWnd, int nIndex);
-		[System.Runtime.InteropServices.DllImport("user32.dll")]
-		static extern int SetWindowLong(IntPtr hWnd, int nIndex, long dwNewLong);
 	}
 }
diff --git a/Source/LibationAvalonia/MessageBox.cs b/Source/LibationAvalonia/MessageBox.cs
index 880c3269..0142bc41 100644
--- a/Source/LibationAvalonia/MessageBox.cs
+++ b/Source/LibationAvalonia/MessageBox.cs
@@ -165,8 +165,6 @@ Libation.
 
 			var dialog = new MessageBoxWindow(saveAndRestorePosition);
 
-			dialog.HideMinMaxBtns();
-
 			var vm = new MessageBoxViewModel(message, caption, buttons, icon, defaultButton);
 			dialog.DataContext = vm;
 			dialog.ControlToFocusOnShow = dialog.FindControl<Control>(defaultButton.ToString());
@@ -190,11 +188,13 @@ Libation.
 
 			tbx.Height = tbx.DesiredSize.Height;
 			tbx.Width = tbx.DesiredSize.Width;
-			dialog.MinHeight = vm.FormHeightFromTboxHeight((int)tbx.DesiredSize.Height);
+
+			var absoluteHeight = vm.FormHeightFromTboxHeight((int)tbx.DesiredSize.Height);
+			dialog.MinHeight = absoluteHeight;
 			dialog.MinWidth = vm.FormWidthFromTboxWidth((int)tbx.DesiredSize.Width);
-			dialog.MaxHeight = dialog.MinHeight;
+			dialog.MaxHeight = absoluteHeight;
 			dialog.MaxWidth = dialog.MinWidth;
-			dialog.Height = dialog.MinHeight;
+			dialog.Height = absoluteHeight;
 			dialog.Width = dialog.MinWidth;
 			return dialog;
 		}
diff --git a/Source/LibationAvalonia/ViewModels/MainVM.BackupCounts.cs b/Source/LibationAvalonia/ViewModels/MainVM.BackupCounts.cs
index 658ef683..7b598c5c 100644
--- a/Source/LibationAvalonia/ViewModels/MainVM.BackupCounts.cs
+++ b/Source/LibationAvalonia/ViewModels/MainVM.BackupCounts.cs
@@ -4,7 +4,6 @@ using DataLayer;
 using LibationFileManager;
 using ReactiveUI;
 using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
 
 namespace LibationAvalonia.ViewModels
@@ -44,9 +43,6 @@ namespace LibationAvalonia.ViewModels
 
 		private void Configure_BackupCounts()
 		{
-			LibraryCommands.LibrarySizeChanged += async (object _, List<LibraryBook> libraryBooks)
-				=> await SetBackupCountsAsync(libraryBooks);
-
 			//Pass null to the setup count to get the whole library.
 			LibraryCommands.BookUserDefinedItemCommitted += async (_, _)
 				=> await SetBackupCountsAsync(null);
diff --git a/Source/LibationAvalonia/ViewModels/MainVM.VisibleBooks.cs b/Source/LibationAvalonia/ViewModels/MainVM.VisibleBooks.cs
index db6fe17b..782337bf 100644
--- a/Source/LibationAvalonia/ViewModels/MainVM.VisibleBooks.cs
+++ b/Source/LibationAvalonia/ViewModels/MainVM.VisibleBooks.cs
@@ -10,8 +10,8 @@ namespace LibationAvalonia.ViewModels
 {
 	partial class MainVM
 	{
-		private int _visibleNotLiberated = 1;
-		private int _visibleCount = 1;
+		private int _visibleNotLiberated = 0;
+		private int _visibleCount = 0;
 
 		/// <summary> The Bottom-right visible book count status text </summary>
 		public string VisibleCountText => $"Visible: {_visibleCount}";
diff --git a/Source/LibationAvalonia/ViewModels/MainVM.cs b/Source/LibationAvalonia/ViewModels/MainVM.cs
index 027f13d9..35089bb0 100644
--- a/Source/LibationAvalonia/ViewModels/MainVM.cs
+++ b/Source/LibationAvalonia/ViewModels/MainVM.cs
@@ -4,6 +4,7 @@ using LibationAvalonia.Views;
 using LibationFileManager;
 using ReactiveUI;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 
 namespace LibationAvalonia.ViewModels
 {
@@ -38,7 +39,9 @@ namespace LibationAvalonia.ViewModels
 
 		private async void LibraryCommands_LibrarySizeChanged(object sender, List<LibraryBook> fullLibrary)
 		{
-			await ProductsDisplay.UpdateGridAsync(fullLibrary);
+			await Task.WhenAll(
+				SetBackupCountsAsync(fullLibrary),
+				ProductsDisplay.UpdateGridAsync(fullLibrary));
 		}
 
 		private static string menufyText(string header) => Configuration.IsMacOs ? header : $"_{header}";
diff --git a/Source/LibationAvalonia/ViewModels/ProcessQueueViewModel.cs b/Source/LibationAvalonia/ViewModels/ProcessQueueViewModel.cs
index d1005185..5ed38d96 100644
--- a/Source/LibationAvalonia/ViewModels/ProcessQueueViewModel.cs
+++ b/Source/LibationAvalonia/ViewModels/ProcessQueueViewModel.cs
@@ -118,7 +118,15 @@ namespace LibationAvalonia.ViewModels
 		#region Add Books to Queue
 
 		private bool isBookInQueue(LibraryBook libraryBook)
-			=> Queue.Any(b => b?.LibraryBook?.Book?.AudibleProductId == libraryBook.Book.AudibleProductId);
+		{
+			var entry = Queue.FirstOrDefault(b => b?.LibraryBook?.Book?.AudibleProductId == libraryBook.Book.AudibleProductId);
+			if (entry == null) 
+				return false;
+			else if (entry.Status is ProcessBookStatus.Cancelled or ProcessBookStatus.Failed)
+				return !Queue.RemoveCompleted(entry);
+			else
+				return true;
+		}
 
 		public void AddDownloadPdf(LibraryBook libraryBook)
 			=> AddDownloadPdf(new List<LibraryBook>() { libraryBook });
diff --git a/Source/LibationAvalonia/ViewModels/Settings/DownloadDecryptSettingsVM.cs b/Source/LibationAvalonia/ViewModels/Settings/DownloadDecryptSettingsVM.cs
index 67ec2567..84032983 100644
--- a/Source/LibationAvalonia/ViewModels/Settings/DownloadDecryptSettingsVM.cs
+++ b/Source/LibationAvalonia/ViewModels/Settings/DownloadDecryptSettingsVM.cs
@@ -21,6 +21,7 @@ namespace LibationAvalonia.ViewModels.Settings
 		public List<Configuration.KnownDirectories> KnownDirectories { get; } = new()
 		{
 			Configuration.KnownDirectories.WinTemp,
+			Configuration.KnownDirectories.ApplicationData,
 			Configuration.KnownDirectories.UserProfile,
 			Configuration.KnownDirectories.AppDir,
 			Configuration.KnownDirectories.MyDocs,
diff --git a/Source/LibationAvalonia/ViewModels/Settings/ImportantSettingsVM.cs b/Source/LibationAvalonia/ViewModels/Settings/ImportantSettingsVM.cs
index c164b449..648f7cd0 100644
--- a/Source/LibationAvalonia/ViewModels/Settings/ImportantSettingsVM.cs
+++ b/Source/LibationAvalonia/ViewModels/Settings/ImportantSettingsVM.cs
@@ -67,7 +67,8 @@ namespace LibationAvalonia.ViewModels.Settings
 		{
 			Configuration.KnownDirectories.UserProfile,
 			Configuration.KnownDirectories.AppDir,
-			Configuration.KnownDirectories.MyDocs
+			Configuration.KnownDirectories.MyDocs,
+			Configuration.KnownDirectories.MyMusic,
 		};
 
 		public string BooksText { get; } = Configuration.GetDescription(nameof(Configuration.Books));
@@ -100,11 +101,14 @@ namespace LibationAvalonia.ViewModels.Settings
 			set
 			{
 				this.RaiseAndSetIfChanged(ref themeVariant, value);
-
-				SelectionChanged = ThemeVariant != initialThemeVariant;
-				this.RaisePropertyChanged(nameof(SelectionChanged));
+				App.Current.RequestedThemeVariant = themeVariant switch
+				{
+					nameof(Avalonia.Styling.ThemeVariant.Dark) => Avalonia.Styling.ThemeVariant.Dark,
+					nameof(Avalonia.Styling.ThemeVariant.Light) => Avalonia.Styling.ThemeVariant.Light,
+					// "System"
+					_ => Avalonia.Styling.ThemeVariant.Default
+				};
 			}
 		}
-		public bool SelectionChanged { get; private set; }
 	}
 }
diff --git a/Source/LibationAvalonia/Views/MainWindow.axaml.cs b/Source/LibationAvalonia/Views/MainWindow.axaml.cs
index f9687d2a..005f3654 100644
--- a/Source/LibationAvalonia/Views/MainWindow.axaml.cs
+++ b/Source/LibationAvalonia/Views/MainWindow.axaml.cs
@@ -8,6 +8,7 @@ using ReactiveUI;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
 
 namespace LibationAvalonia.Views
 {
@@ -60,13 +61,14 @@ namespace LibationAvalonia.Views
 			filterSearchTb.Focus();
 		}
 
-		public async System.Threading.Tasks.Task OnLibraryLoadedAsync(List<LibraryBook> initialLibrary)
+		public async Task OnLibraryLoadedAsync(List<LibraryBook> initialLibrary)
 		{
 			if (QuickFilters.UseDefault)
 				await ViewModel.PerformFilter(QuickFilters.Filters.FirstOrDefault());
 
-			await ViewModel.SetBackupCountsAsync(initialLibrary);
-			await ViewModel.ProductsDisplay.BindToGridAsync(initialLibrary);
+			await Task.WhenAll(
+				ViewModel.SetBackupCountsAsync(initialLibrary),
+				ViewModel.ProductsDisplay.BindToGridAsync(initialLibrary));
 		}
 
 		public void ProductsDisplay_LiberateClicked(object _, LibraryBook libraryBook) => ViewModel.LiberateClicked(libraryBook);
diff --git a/Source/LibationAvalonia/Views/ProcessQueueControl.axaml b/Source/LibationAvalonia/Views/ProcessQueueControl.axaml
index 03323d4e..8c3f3815 100644
--- a/Source/LibationAvalonia/Views/ProcessQueueControl.axaml
+++ b/Source/LibationAvalonia/Views/ProcessQueueControl.axaml
@@ -6,7 +6,7 @@
 	xmlns:views="clr-namespace:LibationAvalonia.Views"
 	xmlns:viewModels="clr-namespace:LibationAvalonia.ViewModels"
 	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-	mc:Ignorable="d" d:DesignWidth="400" d:DesignHeight="850"
+	mc:Ignorable="d" d:DesignWidth="400" d:DesignHeight="650"
 	x:Class="LibationAvalonia.Views.ProcessQueueControl">
 
 	<UserControl.Resources>
@@ -39,7 +39,8 @@
 						<ScrollViewer
 							Name="scroller"
 							HorizontalScrollBarVisibility="Disabled"
-							VerticalScrollBarVisibility="Auto">
+							VerticalScrollBarVisibility="Auto"
+							AllowAutoHide="False">
 							<ItemsRepeater IsVisible="True"
 								Grid.Column="0"
 								Name="repeater"
diff --git a/Source/LibationFileManager/AudibleFileStorage.cs b/Source/LibationFileManager/AudibleFileStorage.cs
index 0de15d83..1a1c8b73 100644
--- a/Source/LibationFileManager/AudibleFileStorage.cs
+++ b/Source/LibationFileManager/AudibleFileStorage.cs
@@ -50,7 +50,7 @@ namespace LibationFileManager
 			get
 			{
 				if (string.IsNullOrWhiteSpace(Configuration.Instance.Books))
-					Configuration.Instance.Books = Path.Combine(Configuration.UserProfile, "Books");
+					Configuration.Instance.Books = Configuration.DefaultBooksDirectory;
 				return Directory.CreateDirectory(Configuration.Instance.Books).FullName;
 			}
 		}
diff --git a/Source/LibationFileManager/Configuration.KnownDirectories.cs b/Source/LibationFileManager/Configuration.KnownDirectories.cs
index 0549d54d..8159e0ff 100644
--- a/Source/LibationFileManager/Configuration.KnownDirectories.cs
+++ b/Source/LibationFileManager/Configuration.KnownDirectories.cs
@@ -14,8 +14,12 @@ namespace LibationFileManager
 		public static string AppDir_Relative => $@".{Path.PathSeparator}{LIBATION_FILES_KEY}";
         public static string AppDir_Absolute => Path.GetFullPath(Path.Combine(ProcessDirectory, LIBATION_FILES_KEY));
         public static string MyDocs => Path.GetFullPath(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "Libation"));
+        public static string MyMusic => Path.GetFullPath(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyMusic), "Libation"));
         public static string WinTemp => Path.GetFullPath(Path.Combine(Path.GetTempPath(), "Libation"));
         public static string UserProfile => Path.GetFullPath(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "Libation"));
+        public static string LocalAppData => Path.GetFullPath(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Libation"));
+        public static string DefaultLibationFilesDirectory => !IsWindows ? LocalAppData : UserProfile;
+        public static string DefaultBooksDirectory => Path.Combine(!IsWindows ? MyMusic : UserProfile, nameof(Books));
 
         public enum KnownDirectories
         {
@@ -34,19 +38,27 @@ namespace LibationFileManager
             MyDocs = 4,
 
             [Description("Your settings folder (aka: Libation Files)")]
-            LibationFiles = 5
-        }
-        // use func calls so we always get the latest value of LibationFiles
-        private static List<(KnownDirectories directory, Func<string?> getPathFunc)> directoryOptionsPaths { get; } = new()
+            LibationFiles = 5,
+			
+            [Description("User Application Data Folder")]
+			ApplicationData = 6,
+			
+            [Description("My Music")]
+			MyMusic = 7,
+		}
+		// use func calls so we always get the latest value of LibationFiles
+		private static List<(KnownDirectories directory, Func<string?> getPathFunc)> directoryOptionsPaths { get; } = new()
         {
             (KnownDirectories.None, () => null),
+            (KnownDirectories.ApplicationData, () => LocalAppData),
+            (KnownDirectories.MyMusic, () => MyMusic),
             (KnownDirectories.UserProfile, () => UserProfile),
             (KnownDirectories.AppDir, () => AppDir_Relative),
             (KnownDirectories.WinTemp, () => WinTemp),
             (KnownDirectories.MyDocs, () => MyDocs),
 			// this is important to not let very early calls try to accidentally load LibationFiles too early.
 			// also, keep this at bottom of this list
-			(KnownDirectories.LibationFiles, () => libationFilesPathCache)
+			(KnownDirectories.LibationFiles, () => LibationSettingsDirectory)
         };
         public static string? GetKnownDirectoryPath(KnownDirectories directory)
         {
diff --git a/Source/LibationFileManager/Configuration.LibationFiles.cs b/Source/LibationFileManager/Configuration.LibationFiles.cs
index c7118fcf..875c1dc7 100644
--- a/Source/LibationFileManager/Configuration.LibationFiles.cs
+++ b/Source/LibationFileManager/Configuration.LibationFiles.cs
@@ -22,11 +22,11 @@ namespace LibationFileManager
         {
             get
             {
-				if (libationFilesPathCache is not null)
-                    return libationFilesPathCache;
+				if (LibationSettingsDirectory is not null)
+                    return LibationSettingsDirectory;
 
                 // FIRST: must write here before SettingsFilePath in next step reads cache
-                libationFilesPathCache = getLibationFilesSettingFromJson();
+                LibationSettingsDirectory = getLibationFilesSettingFromJson();
 
                 // SECOND. before setting to json file with SetWithJsonPath, PersistentDictionary must exist
                 persistentDictionary = new PersistentDictionary(SettingsFilePath);
@@ -42,11 +42,14 @@ namespace LibationFileManager
 
                 SetWithJsonPath(jsonpath, "path", logPath, true);
 
-                return libationFilesPathCache;
+                return LibationSettingsDirectory;
             }
         }
 
-        private static string? libationFilesPathCache { get; set; }
+		/// <summary>
+		/// Directory pointed to by appsettings.json
+		/// </summary>
+        private static string? LibationSettingsDirectory { get; set; }
 
 		/// <summary>
 		/// Try to find appsettings.json in the following locations:
@@ -79,7 +82,7 @@ namespace LibationFileManager
 			string[] possibleAppsettingsDirectories = new[]
 			{
 				ProcessDirectory,
-				Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Libation"),
+				LocalAppData,
 				UserProfile,
 				Path.Combine(Path.GetTempPath(), "Libation")
 			};
@@ -106,9 +109,15 @@ namespace LibationFileManager
 			}
 
 			//Valid appsettings.json not found. Try to create it in each folder.
-			var endingContents = new JObject { { LIBATION_FILES_KEY, UserProfile } }.ToString(Formatting.Indented);
+			var endingContents = new JObject { { LIBATION_FILES_KEY, DefaultLibationFilesDirectory } }.ToString(Formatting.Indented);
+
 			foreach (var dir in possibleAppsettingsDirectories)
 			{
+				//Don't try to create appsettings.json in the program files directory on *.nix systems.
+				//However, still _look_ for one there for backwards compatibility with previous installations
+				if (!IsWindows && dir == ProcessDirectory)
+					continue;
+
 				var appsettingsFile = Path.Combine(dir, appsettings_filename);
 
 				try
@@ -180,7 +189,7 @@ namespace LibationFileManager
 
         public static void SetLibationFiles(string directory)
         {
-            libationFilesPathCache = null;
+            LibationSettingsDirectory = null;
 
             var startingContents = File.ReadAllText(AppsettingsJsonFile);
             var jObj = JObject.Parse(startingContents);
diff --git a/Source/LibationFileManager/Configuration.cs b/Source/LibationFileManager/Configuration.cs
index 4867ce27..4eb01822 100644
--- a/Source/LibationFileManager/Configuration.cs
+++ b/Source/LibationFileManager/Configuration.cs
@@ -18,9 +18,8 @@ namespace LibationFileManager
 
 			var pDic = new PersistentDictionary(settingsFile, isReadOnly: false);
 
-			var booksDir = pDic.GetString(nameof(Books));
-
-			if (booksDir is null) return false;
+			if (pDic.GetString(nameof(Books)) is not string booksDir)
+				return false;
 
 			if (!Directory.Exists(booksDir))
 			{
@@ -28,17 +27,21 @@ namespace LibationFileManager
 					throw new DirectoryNotFoundException(settingsFile);
 
 				//"Books" is not null, so setup has already been run.
-				//Since Books can't be found, try to create it in Libation settings folder
-				booksDir = Path.Combine(dir, nameof(Books));
-				try
+				//Since Books can't be found, try to create it
+				//and then revert to the default books directory
+				foreach (string d in new string[] { booksDir, DefaultBooksDirectory })
 				{
-					Directory.CreateDirectory(booksDir);
+					try
+					{
+						Directory.CreateDirectory(d);
 
-					pDic.SetString(nameof(Books), booksDir);
+						pDic.SetString(nameof(Books), d);
 
-					return booksDir is not null && Directory.Exists(booksDir);
+						return Directory.Exists(d);
+					}
+					catch { /* Do Nothing */ }
 				}
-				catch { return false; }
+				return false;
 			}
 
 			return true;
diff --git a/Source/LibationFileManager/FilePathCache.cs b/Source/LibationFileManager/FilePathCache.cs
index 21aee8f6..96724d4a 100644
--- a/Source/LibationFileManager/FilePathCache.cs
+++ b/Source/LibationFileManager/FilePathCache.cs
@@ -1,8 +1,8 @@
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using Dinah.Core.Collections.Immutable;
 using FileManager;
 using Newtonsoft.Json;
 
@@ -13,78 +13,96 @@ namespace LibationFileManager
 	{
 		public record CacheEntry(string Id, FileType FileType, LongPath Path);
 
-		private const string FILENAME = "FileLocations.json";
+		private const string FILENAME_V2 = "FileLocationsV2.json";
 
 		public static event EventHandler<CacheEntry>? Inserted;
 		public static event EventHandler<CacheEntry>? Removed;
 
-		private static Cache<CacheEntry> cache { get; } = new Cache<CacheEntry>();
+		private static LongPath jsonFileV2 => Path.Combine(Configuration.Instance.LibationFiles, FILENAME_V2);
 
-		private static LongPath jsonFile => Path.Combine(Configuration.Instance.LibationFiles, FILENAME);
+		private static readonly FileCacheV2<CacheEntry> Cache = new();
 
-        static FilePathCache()
-        {
+		static FilePathCache()
+		{
 			// load json into memory. if file doesn't exist, nothing to do. save() will create if needed
-			if (!File.Exists(jsonFile))
+			if (!File.Exists(jsonFileV2))
 				return;
 
-            try
-            {
-                var list = JsonConvert.DeserializeObject<List<CacheEntry>>(File.ReadAllText(jsonFile));
-                if (list is null)
-                    throw new NullReferenceException("File exists but deserialize is null. This will never happen when file is healthy.");
-
-                cache = new Cache<CacheEntry>(list);
-            }
-            catch (Exception ex)
-            {
-                Serilog.Log.Logger.Error(ex, "Error deserializing file. Wrong format. Possibly corrupt. Deleting file. {@DebugInfo}", new { jsonFile });
-                lock (locker)
-                    File.Delete(jsonFile);
-                return;
-            }
-        }
-
-        public static bool Exists(string id, FileType type) => GetFirstPath(id, type) is not null;
-
-		public static List<(FileType fileType, LongPath path)> GetFiles(string id)
-			=> getEntries(entry => entry.Id == id)
-			.Select(entry => (entry.FileType, entry.Path))
-			.ToList();
-
-		public static LongPath? GetFirstPath(string id, FileType type)
-			=> getEntries(entry => entry.Id == id && entry.FileType == type)
-			?.FirstOrDefault()
-			?.Path;
-
-		private static IEnumerable<CacheEntry> getEntries(Func<CacheEntry, bool> predicate)
-		{
-			var entries = cache.Where(predicate).ToList();
-			if (entries is null || !entries.Any())
-				return Enumerable.Empty<CacheEntry>();
-
-			remove(entries.Where(e => !File.Exists(e.Path)).ToList());
-
-			return cache.Where(predicate).ToList();
-		}
-
-		private static void remove(List<CacheEntry> entries)
-		{
-			if (entries is null)
-				return;
-
-			lock (locker)
+			try
 			{
-				foreach (var entry in entries)
-				{
-					cache.Remove(entry);
-					Removed?.Invoke(null, entry);
-				}
-				save();
+				Cache = JsonConvert.DeserializeObject<FileCacheV2<CacheEntry>>(File.ReadAllText(jsonFileV2))
+					?? throw new NullReferenceException("File exists but deserialize is null. This will never happen when file is healthy.");
+			}
+			catch (Exception ex)
+			{
+				Serilog.Log.Logger.Error(ex, "Error deserializing file. Wrong format. Possibly corrupt. Deleting file. {@DebugInfo}", new { jsonFileV2 });
+				lock (locker)
+					File.Delete(jsonFileV2);
+				return;
 			}
 		}
 
-        public static void Insert(string id, string path)
+		public static bool Exists(string id, FileType type) => GetFirstPath(id, type) is not null;
+
+		public static List<(FileType fileType, LongPath path)> GetFiles(string id)
+		{
+			var matchingFiles = Cache.GetIdEntries(id);
+
+			bool cacheChanged = false;
+
+			//Verify all entries exist
+			for (int i = 0; i < matchingFiles.Count; i++)
+			{
+				if (!File.Exists(matchingFiles[i].Path))
+				{
+					matchingFiles.RemoveAt(i);
+					cacheChanged |= Remove(matchingFiles[i]);
+				}
+			}
+			if (cacheChanged)
+				save();
+
+			return matchingFiles.Select(e => (e.FileType, e.Path)).ToList();
+		}
+
+		public static LongPath? GetFirstPath(string id, FileType type)
+		{
+			var matchingFiles = Cache.GetIdEntries(id).Where(e => e.FileType == type).ToList();
+
+			bool cacheChanged = false;
+			try
+			{
+				//Verify entries exist, but return first matching 'type'
+				for (int i = 0; i < matchingFiles.Count; i++)
+				{
+					if (File.Exists(matchingFiles[i].Path))
+						return matchingFiles[i].Path;
+					else
+					{
+						matchingFiles.RemoveAt(i);
+						cacheChanged |= Remove(matchingFiles[i]);
+					}
+				}
+				return null;
+			}
+			finally
+			{
+				if (cacheChanged)
+					save();
+			}
+		}
+
+		private static bool Remove(CacheEntry entry)
+		{
+			if (Cache.Remove(entry.Id, entry))
+			{
+				Removed?.Invoke(null, entry);
+				return true;
+			}
+			return false;
+		}
+
+		public static void Insert(string id, string path)
 		{
 			var type = FileTypes.GetFileTypeFromPath(path);
 			Insert(new CacheEntry(id, type, path));
@@ -92,7 +110,7 @@ namespace LibationFileManager
 
 		public static void Insert(CacheEntry entry)
 		{
-			cache.Add(entry);
+			Cache.Add(entry.Id, entry);
 			Inserted?.Invoke(null, entry);
 			save();
 		}
@@ -102,7 +120,7 @@ namespace LibationFileManager
 		private static void save()
 		{
 			// create json if not exists
-			static void resave() => File.WriteAllText(jsonFile, JsonConvert.SerializeObject(cache.ToList(), Formatting.Indented));
+			static void resave() => File.WriteAllText(jsonFileV2, JsonConvert.SerializeObject(Cache, Formatting.Indented));
 
 			lock (locker)
 			{
@@ -112,11 +130,41 @@ namespace LibationFileManager
 					try { resave(); }
 					catch (IOException ex)
 					{
-						Serilog.Log.Logger.Error(ex, $"Error saving {FILENAME}");
+						Serilog.Log.Logger.Error(ex, $"Error saving {FILENAME_V2}");
 						throw;
 					}
 				}
 			}
-        }
-    }
+		}
+
+		private class FileCacheV2<TEntry>
+		{
+			[JsonProperty]
+			private readonly ConcurrentDictionary<string, List<TEntry>> Dictionary = new();
+
+			public List<TEntry> GetIdEntries(string id)
+			{
+				static List<TEntry> empty() => new();
+
+				return Dictionary.TryGetValue(id, out var entries) ? entries.ToList() : empty();
+			}
+
+			public void Add(string id, TEntry entry)
+			{
+				Dictionary.AddOrUpdate(id, [entry], (id, entries) => { entries.Add(entry); return entries; });
+			}
+
+			public void AddRange(string id, IEnumerable<TEntry> entries)
+			{
+				Dictionary.AddOrUpdate(id, entries.ToList(), (id, entries) =>
+				{
+					entries.AddRange(entries);
+					return entries;
+				});
+			}
+
+			public bool Remove(string id, TEntry entry)
+				=> Dictionary.TryGetValue(id, out List<TEntry>? entries) && entries.Remove(entry);
+		}
+	}
 }
diff --git a/Source/LibationFileManager/FileTypes.cs b/Source/LibationFileManager/FileTypes.cs
index 91c2fd25..591525b9 100644
--- a/Source/LibationFileManager/FileTypes.cs
+++ b/Source/LibationFileManager/FileTypes.cs
@@ -11,6 +11,7 @@ namespace LibationFileManager
 	{
 		private static Dictionary<string, FileType> dic => new()
 		{
+			["aax"] = FileType.AAXC,
 			["aaxc"] = FileType.AAXC,
 			["cue"] = FileType.Cue,
 			["pdf"] = FileType.PDF,
diff --git a/Source/LibationUiBase/TrackedQueue[T].cs b/Source/LibationUiBase/TrackedQueue[T].cs
index 2df99d7e..51f36f0b 100644
--- a/Source/LibationUiBase/TrackedQueue[T].cs
+++ b/Source/LibationUiBase/TrackedQueue[T].cs
@@ -169,6 +169,16 @@ namespace LibationUiBase
 			}
 		}
 
+		public T FirstOrDefault(Func<T, bool> predicate)
+		{
+			lock (lockObject)
+			{
+				return Current != null && predicate(Current) ? Current
+					: _completed.FirstOrDefault(predicate) is T completed ? completed
+					: _queued.FirstOrDefault(predicate);
+			}
+		}
+
 		public void MoveQueuePosition(T item, QueuePosition requestedPosition)
 		{
 			lock (lockObject)
diff --git a/Source/LibationWinForms/Dialogs/SettingsDialog.DownloadDecrypt.cs b/Source/LibationWinForms/Dialogs/SettingsDialog.DownloadDecrypt.cs
index 0aa15dfa..49894a7c 100644
--- a/Source/LibationWinForms/Dialogs/SettingsDialog.DownloadDecrypt.cs
+++ b/Source/LibationWinForms/Dialogs/SettingsDialog.DownloadDecrypt.cs
@@ -37,6 +37,7 @@ namespace LibationWinForms.Dialogs
 			inProgressSelectControl.SetDirectoryItems(new()
 			{
 				Configuration.KnownDirectories.WinTemp,
+				Configuration.KnownDirectories.ApplicationData,
 				Configuration.KnownDirectories.UserProfile,
 				Configuration.KnownDirectories.AppDir,
 				Configuration.KnownDirectories.MyDocs,
diff --git a/Source/LibationWinForms/Dialogs/SettingsDialog.Important.cs b/Source/LibationWinForms/Dialogs/SettingsDialog.Important.cs
index 7f68667a..fead9d0b 100644
--- a/Source/LibationWinForms/Dialogs/SettingsDialog.Important.cs
+++ b/Source/LibationWinForms/Dialogs/SettingsDialog.Important.cs
@@ -44,7 +44,8 @@ namespace LibationWinForms.Dialogs
 				{
 					Configuration.KnownDirectories.UserProfile,
 					Configuration.KnownDirectories.AppDir,
-					Configuration.KnownDirectories.MyDocs
+					Configuration.KnownDirectories.MyDocs,
+					Configuration.KnownDirectories.MyMusic,
 				},
 				Configuration.KnownDirectories.UserProfile,
 				"Books");
diff --git a/Source/LibationWinForms/Form1.ProcessQueue.cs b/Source/LibationWinForms/Form1.ProcessQueue.cs
index ab9c1147..306aba39 100644
--- a/Source/LibationWinForms/Form1.ProcessQueue.cs
+++ b/Source/LibationWinForms/Form1.ProcessQueue.cs
@@ -105,13 +105,14 @@ namespace LibationWinForms
 				splitContainer1.Panel2Collapsed = false;
 				processBookQueue1.popoutBtn.Visible = true;
 			}
+
+			Configuration.Instance.SetNonString(splitContainer1.Panel2Collapsed, nameof(splitContainer1.Panel2Collapsed));
 			toggleQueueHideBtn.Text = splitContainer1.Panel2Collapsed ? "❰❰❰" : "❱❱❱";
 		}
 
 		private void ToggleQueueHideBtn_Click(object sender, EventArgs e)
 		{
 			SetQueueCollapseState(!splitContainer1.Panel2Collapsed);
-			Configuration.Instance.SetNonString(splitContainer1.Panel2Collapsed, nameof(splitContainer1.Panel2Collapsed));
 		}
 
 		private void ProcessBookQueue1_PopOut(object sender, EventArgs e)
diff --git a/Source/LibationWinForms/Form1.cs b/Source/LibationWinForms/Form1.cs
index 50232c5c..33b06b0e 100644
--- a/Source/LibationWinForms/Form1.cs
+++ b/Source/LibationWinForms/Form1.cs
@@ -17,7 +17,7 @@ namespace LibationWinForms
 			//Set this size before restoring form size and position
 			splitContainer1.Panel2MinSize = this.DpiScale(350);
 			this.RestoreSizeAndLocation(Configuration.Instance);
-			this.FormClosing += (_, _) => this.SaveSizeAndLocation(Configuration.Instance);
+			FormClosing += Form1_FormClosing;
 
 			// this looks like a perfect opportunity to refactor per below.
 			// since this loses design-time tooling and internal access, for now I'm opting for partial classes
@@ -58,6 +58,14 @@ namespace LibationWinForms
 			Shown += Form1_Shown;
 		}
 
+		private void Form1_FormClosing(object sender, FormClosingEventArgs e)
+		{
+			//Always close the queue before saving the form to prevent
+			//Form1 from getting excessively wide when it's restored.
+			SetQueueCollapseState(true);
+			this.SaveSizeAndLocation(Configuration.Instance);
+		}
+
 		private async void Form1_Shown(object sender, EventArgs e)
 		{
 			if (Configuration.Instance.FirstLaunch)
diff --git a/Source/LibationWinForms/ProcessQueue/ProcessQueueControl.cs b/Source/LibationWinForms/ProcessQueue/ProcessQueueControl.cs
index da7bebbc..c993c8b6 100644
--- a/Source/LibationWinForms/ProcessQueue/ProcessQueueControl.cs
+++ b/Source/LibationWinForms/ProcessQueue/ProcessQueueControl.cs
@@ -82,7 +82,15 @@ namespace LibationWinForms.ProcessQueue
 		}
 
 		private bool isBookInQueue(DataLayer.LibraryBook libraryBook)
-			=> Queue.Any(b => b?.LibraryBook?.Book?.AudibleProductId == libraryBook.Book.AudibleProductId);
+		{
+			var entry = Queue.FirstOrDefault(b => b?.LibraryBook?.Book?.AudibleProductId == libraryBook.Book.AudibleProductId);
+			if (entry == null)
+				return false;
+			else if (entry.Status is ProcessBookStatus.Cancelled or ProcessBookStatus.Failed)
+				return !Queue.RemoveCompleted(entry);
+			else
+				return true;
+		}
 
 		public void AddDownloadPdf(DataLayer.LibraryBook libraryBook)
 			=> AddDownloadPdf(new List<DataLayer.LibraryBook>() { libraryBook });
diff --git a/Source/LibationWinForms/Program.cs b/Source/LibationWinForms/Program.cs
index 2378c0e3..35aa0224 100644
--- a/Source/LibationWinForms/Program.cs
+++ b/Source/LibationWinForms/Program.cs
@@ -98,7 +98,7 @@ namespace LibationWinForms
 			if (config.LibationSettingsAreValid)
 				return;
 
-			var defaultLibationFilesDir = Configuration.UserProfile;
+			var defaultLibationFilesDir = Configuration.DefaultLibationFilesDirectory;
 
 			// check for existing settings in default location
 			var defaultSettingsFile = Path.Combine(defaultLibationFilesDir, "Settings.json");
@@ -154,7 +154,7 @@ namespace LibationWinForms
 
 			// INIT DEFAULT SETTINGS
 			// if 'new user' was clicked, or if 'returning user' chose new install: show basic settings dialog
-			config.Books ??= Path.Combine(defaultLibationFilesDir, "Books");
+			config.Books ??= Configuration.DefaultBooksDirectory;
 
 			if (config.LibationSettingsAreValid)
 				return;