>Hrm. Well, it doesn't happen with any button other then the X (or at least I haven't noticed it).. and while I'm sure sometimes I moved off the button before I let go, I know that most of the time I don't (I am very careful with it now that I've noticed it)... And it happens on all of the computers here in the office (about 25 or so), and most of our customers computers... So I doubt it's the mouse driver.
>
>Thanks for your suggestions though :)
>

I'm fairly certain I've seen it on things besides the 'X'. I think I've seen it on menu items. I need to pay more attention. It seems to be a bug, and it would be nice to have it fixed.