After our last upgrade several avatars were deleted as I messed something up when transferring files to our FTP.
Some old users still had the no-longer available avatars shown. That caused tons of http-errors which I now fixed.
I turned off the option for everybody to show avatars, which also disables old members who had the Warcraft 3 avatars from showing them.
To see/show avatars again do the following in your vBulletin options: Show Avatars on Flickr - Photo Sharing!
I also added several new avatars from which you can choose. They are pretty cool :-).