I tried to change my profile pic in the forum and then it would appear in transformice. I tried to log out and log back in (as suggested) but nothing will work it appears in the forum but not in transformice... :/

http://avatars.atelier801.com/7458/11637458.jpg?1448607616601
Open this link and hold down CTRL and press F5, then log back into the game and see if that resolves it.

I tried that right now and it didn't work...

Bumping this up to say I'm having this issue. Tig needs to flush the Flash cache.

Same happens to me.It won`t upload on profile