I'm in the same boat!!
I seem to be having no luck in uploading animated gifs (avatars) into my thread "Free Timmy Avatars for you...
Everytime I try posting a message with an attachment, my browser just hangs there and I end up with a "cannot display page" timeout error.
I'm doing the same exact procedure I did when I uploaded all of the other avatars I made for people.
Is there something wrong with the server end or my end?