diff --git a/Filtration/Filtration.nuspec b/Filtration/Filtration.nuspec
index a1e9127..b822391 100644
--- a/Filtration/Filtration.nuspec
+++ b/Filtration/Filtration.nuspec
@@ -10,12 +10,14 @@
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <copyright>Copyright 2018</copyright>
     <releaseNotes>* Added support for new Prophecies block item type
+* Added Betrayal League Item Base Types and Item Classes to static data
 * All open filter scripts are now remembered on exit and reopened when the application is started rather than just the last opened one (#95)
 * Filter sections are once again now expanded by default when scripts are opened, unless the new "Auto-expand all sections when opening scripts" setting is disabled
 * A new Clear Styles button has been added which removes all styles from the selected block (#96)
 * New buttons for adding/removing DisableDropSound from selected blocks have been added (#110)
 * The Enable/Disable Block toggle button is now visible on both the Regular Block Items and Appearance Block Items views
 * When there are too many block items to fit horizontally in a block a horizontal scrollbar will now appear
+* Fixed the previously incorrect handling of DisableDropSound as a true/false value when in fact it is enabled/disabled purely by its presence or lack thereof in a block (#111)
 * Fixed the application freezing for a long period of time when Ctrl+A (Select All) is performed
 * Fixed the Switch to Appearance/Regular Block Items text overlapping block items
 * Fixed theme saving (blank theme files were being saved) (#83)
diff --git a/Filtration/Services/UpdateService.cs b/Filtration/Services/UpdateService.cs
index 120f628..dcb2a15 100644
--- a/Filtration/Services/UpdateService.cs
+++ b/Filtration/Services/UpdateService.cs
@@ -1,5 +1,7 @@
 using System;
+using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Filtration.Enums;
@@ -117,6 +119,17 @@ namespace Filtration.Services
                 _downloadPrereleaseUpdates = true;
 #endif
 
+                var expectedInstallationPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Filtration");
+                var baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
+
+                var runningInstalled = baseDirectory.StartsWith(expectedInstallationPath);
+
+                if (!runningInstalled)
+                {
+                    Logger.Debug($"Skipping update check since base directory of {baseDirectory} does not start with the expected installation path of {expectedInstallationPath}");
+                    return;
+                }
+
                 async Task CheckForUpdatesAsync(IUpdateManager updateManager)
                 {
                     _updates = await updateManager.CheckForUpdate(progress: progress => UpdateProgressChanged?.Invoke(this, new UpdateProgressChangedEventArgs(progress)));
diff --git a/Filtration/Views/ItemFilterBlockView.xaml b/Filtration/Views/ItemFilterBlockView.xaml
index 02cadb6..5b84db6 100644
--- a/Filtration/Views/ItemFilterBlockView.xaml
+++ b/Filtration/Views/ItemFilterBlockView.xaml
@@ -158,7 +158,7 @@
                                         Visibility="{Binding HasPositionalSound, Converter={StaticResource BooleanVisibilityConverter}}"
                                         Background="Transparent"
                                         BorderBrush="Transparent"
-                                        ToolTip="Click to preview drop sound">
+                                        ToolTip="Click to preview positional drop sound">
                                     <Image Source="/Filtration;component/Resources/Icons/speaker_icon.png"  VerticalAlignment="Center" HorizontalAlignment="Center" />
                                 </Button>
                                 <Button Command="{Binding PlayCustomSoundCommand}"
@@ -170,7 +170,7 @@
                                         Visibility="{Binding HasCustomSound, Converter={StaticResource BooleanVisibilityConverter}}"
                                         Background="Transparent"
                                         BorderBrush="Transparent"
-                                        ToolTip="Click to preview drop sound">
+                                        ToolTip="Click to preview custom drop sound">
                                     <Image Source="/Filtration;component/Resources/Icons/speaker_icon.png"  VerticalAlignment="Center" HorizontalAlignment="Center" />
                                 </Button>
                                 <Line Y1="5" Y2="38" StrokeThickness="2" Panel.ZIndex="999"