I've noticed this in both Firefox and IE (yes, a lot of my clients still only use IE...hard to train an old dog new tricks).
I have also attached a screenshot of what I am talking about. If i use the ImageDOM, and go in to edit the images, the overlay has double scroll bars and this is confusing my clients. Some don't know to scroll to get to the other scroll...thus, they think they can't edit the images.
I was wondering if anyone else is seeing this...or if there was a fix, or if I can manually make the overlay box bigger?