This happens in Mozilla (1.2.1 and now 1.3) and Safari: the arrow cursor turns into the hand "hotspot indicator" when over a button, and then the cursor remains a hand even after the user has rolled off the button. The only way to get the arrow cursor back is to go outside the flash movie altogether. This only happens when I'm viewing the .swf embedded in an html file, and never when I'm just viewing the raw .swf.

I'm thought somebody else must've seen this. I didn't find anything in MM's Tech Notes.