Sometimes it leaves the bars in config mode, sometimes the wrong button is added (I think this can happen when moving a button to an empty button location after having added or moved a button previously), sometimes the button being moved off the bar remains stuck to the cursor even when you click away from the bars (infrequent but it's happened a few times), etc.

Hrm. I'll have to play with it. I thought I finally had this one ironed out. I spent a TON of time rewriting this a couple months ago

Ok, I'll come up with some specific examples then and will add them as I find them. I always have grid disabled, if that isn't normal then that may be why I'm seeing some that others are.

Note: looks like some scenarios may have been fixed since the last time I was making significant layout changes.

• Moving a button over another button, then clicking off the bars to get rid of the replaced button (I create temporary macros a lot that tend to take a hotkey location away from another button), leaves the bar with the grid showing (sorry, thought it was config state but paid more attention this time) for all bars.
• [Requires duplication] Button stuck on the cursor is infrequent, if I figure out a duplication scenario I'll advise.
• [Requires duplication] When moving a button to a new location it sometimes creates the wrong button; I'm assuming this is taint from something that happened previously, if I figure out a duplication scenario I'll advise but this has happened within the past couple of days.
• Dragging a pet spell to the pet bar