diff --git a/Toolset/palettes/script editor/behaviors/revsevariablespanebehavior.livecodescript b/Toolset/palettes/script editor/behaviors/revsevariablespanebehavior.livecodescript
index aab416aaee..f7c9fcf8c0 100644
--- a/Toolset/palettes/script editor/behaviors/revsevariablespanebehavior.livecodescript	
+++ b/Toolset/palettes/script editor/behaviors/revsevariablespanebehavior.livecodescript	
@@ -318,6 +318,8 @@ private on nodeCreateVisualizationObject pPathToNode
    revMetadataSet the name of stack tStack, "general", "visualizer", true
    
    -- generate variable visualizer UI
+   local tOldDefaultStack
+   put the defaultStack into tOldDefaultStack
    set the defaultStack to the short name of tStack
    reset the templateButton
    set the height of the templateButton to 23
@@ -340,6 +342,7 @@ private on nodeCreateVisualizationObject pPathToNode
    reset the templateButton
    reset the templateField
    set the lockMessages to tOldLock
+   set the defaultStack to tOldDefaultStack
    
    return tStack
 end nodeCreateVisualizationObject
diff --git a/notes/bugfix-21100.md b/notes/bugfix-21100.md
new file mode 100644
index 0000000000..4b626d82ca
--- /dev/null
+++ b/notes/bugfix-21100.md
@@ -0,0 +1 @@
+# Ensure the defaultStack does not change after opening revVariableVisualizer stack