diff --git a/LightlessSync/LightlessConfiguration/Configurations/LightlessConfig.cs b/LightlessSync/LightlessConfiguration/Configurations/LightlessConfig.cs
index 9b4055b..829bca5 100644
--- a/LightlessSync/LightlessConfiguration/Configurations/LightlessConfig.cs
+++ b/LightlessSync/LightlessConfiguration/Configurations/LightlessConfig.cs
@@ -154,4 +154,5 @@ public class LightlessConfig : ILightlessConfiguration
     public bool SyncshellFinderEnabled { get; set; } = false;
     public string? SelectedFinderSyncshell { get; set; } = null;
     public string LastSeenVersion { get; set; } = string.Empty;
+    public HashSet<Guid> OrphanableTempCollections { get; set; } = [];
 }
diff --git a/LightlessSync/PlayerData/Pairs/PairHandlerAdapter.cs b/LightlessSync/PlayerData/Pairs/PairHandlerAdapter.cs
index 99ada4e..178daa8 100644
--- a/LightlessSync/PlayerData/Pairs/PairHandlerAdapter.cs
+++ b/LightlessSync/PlayerData/Pairs/PairHandlerAdapter.cs
@@ -46,6 +46,7 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
     private readonly TextureDownscaleService _textureDownscaleService;
     private readonly PairStateCache _pairStateCache;
     private readonly PairPerformanceMetricsCache _performanceMetricsCache;
+    private readonly PenumbraTempCollectionJanitor _tempCollectionJanitor;
     private readonly PairManager _pairManager;
     private CancellationTokenSource? _applicationCancellationTokenSource;
     private Guid _applicationId;
@@ -181,7 +182,8 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
         ServerConfigurationManager serverConfigManager,
         TextureDownscaleService textureDownscaleService,
         PairStateCache pairStateCache,
-        PairPerformanceMetricsCache performanceMetricsCache) : base(logger, mediator)
+        PairPerformanceMetricsCache performanceMetricsCache,
+        PenumbraTempCollectionJanitor tempCollectionJanitor) : base(logger, mediator)
     {
         _pairManager = pairManager;
         Ident = ident;
@@ -199,7 +201,7 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
         _textureDownscaleService = textureDownscaleService;
         _pairStateCache = pairStateCache;
         _performanceMetricsCache = performanceMetricsCache;
-        LastAppliedDataBytes = -1;
+        _tempCollectionJanitor = tempCollectionJanitor;
     }
 
     public void Initialize()
@@ -422,6 +424,7 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
             {
                 _penumbraCollection = created;
                 _pairStateCache.StoreTemporaryCollection(Ident, created);
+                _tempCollectionJanitor.Register(created);
             }
 
             return _penumbraCollection;
@@ -454,6 +457,7 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
             _needsCollectionRebuild = true;
             _forceFullReapply = true;
             _forceApplyMods = true;
+            _tempCollectionJanitor.Unregister(toRelease);
         }
 
         if (!releaseFromPenumbra || toRelease == Guid.Empty || !_ipcManager.Penumbra.APIAvailable)
diff --git a/LightlessSync/PlayerData/Pairs/PairHandlerAdapterFactory.cs b/LightlessSync/PlayerData/Pairs/PairHandlerAdapterFactory.cs
index 2001f1f..5169820 100644
--- a/LightlessSync/PlayerData/Pairs/PairHandlerAdapterFactory.cs
+++ b/LightlessSync/PlayerData/Pairs/PairHandlerAdapterFactory.cs
@@ -31,6 +31,7 @@ internal sealed class PairHandlerAdapterFactory : IPairHandlerAdapterFactory
     private readonly TextureDownscaleService _textureDownscaleService;
     private readonly PairStateCache _pairStateCache;
     private readonly PairPerformanceMetricsCache _pairPerformanceMetricsCache;
+    private readonly PenumbraTempCollectionJanitor _tempCollectionJanitor;
 
     public PairHandlerAdapterFactory(
         ILoggerFactory loggerFactory,
@@ -48,7 +49,8 @@ internal sealed class PairHandlerAdapterFactory : IPairHandlerAdapterFactory
         ServerConfigurationManager serverConfigManager,
         TextureDownscaleService textureDownscaleService,
         PairStateCache pairStateCache,
-        PairPerformanceMetricsCache pairPerformanceMetricsCache)
+        PairPerformanceMetricsCache pairPerformanceMetricsCache,
+        PenumbraTempCollectionJanitor tempCollectionJanitor)
     {
         _loggerFactory = loggerFactory;
         _mediator = mediator;
@@ -66,6 +68,7 @@ internal sealed class PairHandlerAdapterFactory : IPairHandlerAdapterFactory
         _textureDownscaleService = textureDownscaleService;
         _pairStateCache = pairStateCache;
         _pairPerformanceMetricsCache = pairPerformanceMetricsCache;
+        _tempCollectionJanitor = tempCollectionJanitor;
     }
 
     public IPairHandlerAdapter Create(string ident)
@@ -91,6 +94,7 @@ internal sealed class PairHandlerAdapterFactory : IPairHandlerAdapterFactory
             _serverConfigManager,
             _textureDownscaleService,
             _pairStateCache,
-            _pairPerformanceMetricsCache);
+            _pairPerformanceMetricsCache,
+            _tempCollectionJanitor);
     }
 }
diff --git a/LightlessSync/Plugin.cs b/LightlessSync/Plugin.cs
index a6e33ac..40d4077 100644
--- a/LightlessSync/Plugin.cs
+++ b/LightlessSync/Plugin.cs
@@ -135,6 +135,7 @@ public sealed class Plugin : IDalamudPlugin
         services.AddSingleton<ZoneChatService>();
         services.AddSingleton<IdDisplayHandler>();
         services.AddSingleton<PlayerPerformanceService>();
+        services.AddSingleton<PenumbraTempCollectionJanitor>();
 
         services.AddSingleton<TextureMetadataHelper>(sp =>
             new TextureMetadataHelper(sp.GetRequiredService<ILogger<TextureMetadataHelper>>(), gameData));
diff --git a/LightlessSync/Services/PenumbraTempCollectionJanitor.cs b/LightlessSync/Services/PenumbraTempCollectionJanitor.cs
new file mode 100644
index 0000000..03fb53b
--- /dev/null
+++ b/LightlessSync/Services/PenumbraTempCollectionJanitor.cs
@@ -0,0 +1,71 @@
+using LightlessSync.Interop.Ipc;
+using LightlessSync.LightlessConfiguration;
+using LightlessSync.Services.Mediator;
+using Microsoft.Extensions.Logging;
+
+namespace LightlessSync.Services;
+
+public sealed class PenumbraTempCollectionJanitor : DisposableMediatorSubscriberBase
+{
+    private readonly IpcManager _ipc;
+    private readonly LightlessConfigService _config; 
+    private int _ran;
+
+    public PenumbraTempCollectionJanitor(
+        ILogger<PenumbraTempCollectionJanitor> logger,
+        LightlessMediator mediator,
+        IpcManager ipc,
+        LightlessConfigService config) : base(logger, mediator)
+    {
+        _ipc = ipc;
+        _config = config;
+
+        Mediator.Subscribe<PenumbraInitializedMessage>(this, _ => CleanupOrphansOnBoot());
+    }
+
+    public void Register(Guid id)
+    {
+        if (id == Guid.Empty) return;
+        if (_config.Current.OrphanableTempCollections.Add(id))
+            _config.Save();
+    }
+
+    public void Unregister(Guid id)
+    {
+        if (id == Guid.Empty) return;
+        if (_config.Current.OrphanableTempCollections.Remove(id))
+            _config.Save();
+    }
+
+    private void CleanupOrphansOnBoot()
+    {
+        if (Interlocked.Exchange(ref _ran, 1) == 1)
+            return;
+
+        if (!_ipc.Penumbra.APIAvailable)
+            return;
+
+        var ids = _config.Current.OrphanableTempCollections.ToArray();
+        if (ids.Length == 0)
+            return;
+
+        var appId = Guid.NewGuid();
+        Logger.LogInformation("Cleaning up {count} orphaned Lightless temp collections found in configuration", ids.Length);
+
+        foreach (var id in ids)
+        {
+            try
+            {
+                _ipc.Penumbra.RemoveTemporaryCollectionAsync(Logger, appId, id)
+                    .GetAwaiter().GetResult();
+            }
+            catch (Exception ex)
+            {
+                Logger.LogDebug(ex, "Failed removing orphaned temp collection {id}", id);
+            }
+        }
+
+        _config.Current.OrphanableTempCollections.Clear();
+        _config.Save();
+    }
+}
\ No newline at end of file
diff --git a/LightlessSync/UI/DownloadUi.cs b/LightlessSync/UI/DownloadUi.cs
index c326c58..2d9cdc1 100644
--- a/LightlessSync/UI/DownloadUi.cs
+++ b/LightlessSync/UI/DownloadUi.cs
@@ -178,6 +178,11 @@ public class DownloadUi : WindowMediatorSubscriberBase
         foreach (var transfer in transfers)
         {
             var transferKey = transfer.Key;
+
+            // Skip if no valid game object
+            if (transferKey.GetGameObject() == null)
+                continue;
+
             var rawPos = _dalamudUtilService.WorldToScreen(transferKey.GetGameObject());
 
             // If RawPos is zero, remove it from smoothed dictionary