Users cannot change avatar once they pick it once
Users cannot change avatar once they pick it once.. it just reverts back to the old one.
Also have users reporting timeout errors. http://prntscr.com/bt8izg
What about an emojis plug in?
I see you've changed your avatar. So it works. Please provide with more data. An exact example.
The timeout error is server/hosting error. It doesn't have any relation to wpForo. Make sure you're not uploading a big image or it doesn't take more than 30 sec. All those are server configuration issues. Please read this instruction: https://codex.wordpress.org/Common_WordPress_Errors#Connection_Timed_Out
The avatar can be changed once, but then it is locked and it doesn't change when you try to upload a new image....All users on my forum are having this issue.
As far as the error, I do not have anything on my site except for the forum.. no large pictures.