For anyone having trouble with changing their profile avatar or cover, try this.
https://xenogamers.com/account/avatar/ for changing your profile picture/avatar
https://xenogamers.com/covers/profile/[your URL ID] for changing your profile cover
To find your URL ID, go to your profile page (i.e xenogamers.com/members/111111) and copy the 6 numbers at the end of the URL.
For example, my cover page would be https://xenogamers.com/covers/profile/109835/
These work-arounds should work until the problems get fixed.