Try clearing all browser cache/cookies....then try running
http://www.stevengould.org/index.php...d=29&Itemid=72.......could be your profile is hosed up/corrupt or your browsers are holding on to something yuckee.
Couple of things to try.....
Install a different browser....ie: Chrome/Ffox? See if that helps, if not...., create another user account on your computer...log in as that one and try changing your avatar. I've seen corrupt profiles do that before.
What's the matter, grew tired of the one I created for you....LOL......wow, that was a long time ago, Hope things are going great for you and the family Bruce.