First post updated : the stalled avatars fixed as well ?
Hey Darfeyn (and others), I’ve got good news : at least a part of the stalled avatars were just fixed !
To update it back, just :
- Log out and back in.
- Or delete your browser’s cookies, and log back-in.
That should be enough to refresh it. Even better, if you do change it ingame, check your battlenet player profile : as soon at the portrait refreshes into it (< 2 minutes), you can do the above refresh maneuvers to get it changed into the forums as well. 
Thanks for reporting the good news, guys !
As Dallarian said, that fix brings backs a bit more colors in our battlenet exchanges. But there’s also another bright side to it, it being that if will be more difficult for trolls to create an account imitating another (with the same name), as their newly created ones now won’t necessarily have the same portraits unlocked ingame. In other words, that means less smurfing/trolling on the forums ! 
In fact the avatars fixed were stalled as well, there had been a second and third wave affecting about 50% of the profiles since the 22th of October. 
If your avatar still is blocked on the default one after doing the above refresh maneuvers, do report it here and we’ll study your case. 