Hi there!
Avatar'less Brisky, here...
The problem started when I wanted to change my avatar for a bit of a joke. Simply nothing happened when I tried to upload, or specify an avatar via URL. The page would just refresh, say the changes had been apllied. However, it would just remain with the same old avatar I had, with the avatar option set back to "upload avater"
Then I tried to pick one of the (hideous) avatars from the gallery list.
That worked, but when I removed that I still couldn't upload, or specify, an avatar. and when I would try to, the page would simply refresh again, saying "The changes have been applied", but there would be no avatar, and the selection button would be back on the "No avatar" button.
The rest does just work, tho. Personal text, changing name, and so-on doesn't seem to be affected by this.