So, everyone logs in and notices their avatar is COMPLETELY blank, right? well STaff is going to handle the situation as if now, but If you're real impatient and can't handle it then here:
I had the same problem, but I fixed it now, so I wanted to share how I fixed it :
1- if you're on chat, get out
2- change into the default avatar (wikia ones)
3- next, enter chat and see if it works and everyone can see it, if it does not, repeat steps 1 and 2, until it works,if it works get out of chat and go back to change yoru profile pic
4- It works now, upload it to a different one ( it won't work with the one you always use)
5- enter chat, if it does not work repeat all steps until it works
hope this helps.