I tried to see if this issue occured with other GUIObjects, but I could not replicate it to anything else but the ImageButton.
The issue occurs on any kind of canvas. I tested BillboardGUI, SurfaceGUI and ScreenGUI. An important factor to note here is that it required a valid Image URL for it to occur.
But don’t the mouse events only fire if Active is set to true anyway?
Meaning that, theoretically speaking, the white box should appear when active is selected.
Anyway, you could rotate the image before uploading it to roblox to work around this as well.[/quote]
Pretty sure the Active property just handles whether it sends updates below it - so if it’s true, you’ll have a ‘bubble’ effect - that is, the event is bubbled out from the sender to the parents.