Several minutes after dragging an item in Balsa, a ghosty little 'draggable 
item' icon will move back from the target to the source ***In front of a 
non-Balsa window, if the Balsa window is covered up***

This appears to be the same icon that follows the mouse when an item is 
being dragged.

Open a mailbox, select an item, drag it to a different mailbox.

Register displeasure with the results, bring up a browser window (I'm using 
Netscape 7.0).  Make sure the browser window covers the Balsa window.  Begin 
composing a Balsa bug.

While you're typing, a little cursor will fly across the browser window,
apparently moving from the target to the source of the drag!