I am having issues with my avatar going missing in the threads sometimes. It's back in the gallery section though.
I think that's unrelated. I recently moved all avatars out of the database and into the file system so it could be some weirdness with your avatar file. The gallery issue was a bad piece of code that I corrected. You may want to try saving your avatar to your PC, change the file name, then re-load it into APUG. I would be curious to know if that helps.