Not sure about "glitch" but try it again with a standard format of picture which is needed
Forums are dun broken.
When you try to upload textures/replays/avatars:
Textures wont show up, even if it says "Uploaded succesfully".
Replays wont open
Avatars wont show, even if it says "Uploaded succesfully".
The devs are currently trying to fix the problem.