diff --git a/ViewModels/MainViewModel.cs b/ViewModels/MainViewModel.cs
index 33e7667..5817f58 100644
--- a/ViewModels/MainViewModel.cs
+++ b/ViewModels/MainViewModel.cs
@@ -107,6 +107,21 @@ public partial class MainViewModel : ViewModelBase
     {
         if (e.PropertyName == nameof(SceneElement.UseDefaultBackground))
         {
+            // ⛔ Turning the default back ON has to RE-STAMP the shipped art. Browse… writes the
+            // custom image into both CustomBackgroundPath AND AssetId, so without this the toggle
+            // flipped a bool while the preview kept showing the custom picture — the setting
+            // appeared to do nothing (creator report, 2026-11-01).
+            if (StagedScene is { } scene)
+            {
+                var background = scene.Elements.OfType<Source>().FirstOrDefault(s => s.IsBackground);
+                if (background is { UseDefaultBackground: true })
+                {
+                    background.CustomBackgroundPath = null;
+                    background.AssetId = null;                    // lets the stamp run
+                    StampDefaultBackgroundAsset(background, scene.Name);
+                }
+            }
+
             if (StagedScene != null) _sceneGraph.InvalidateBake(StagedScene);
             UpdateBackgroundImage();
             RefreshSnapshotsAsync();