The past few months when I'm in a crowded area (say >30 avatars within 20 meters) the avatars furthest away disappear from my viewer. They aren't greyed out or low LOD, they are totally invisible. Objects aren't affected. I have to cam in to about 5 meters away before the avatars reappear.
I can't recall if this problem showed up with a particular version, but it's very annoying at music events and so on. I've tried changing every graphics setting, upping my texture cache, etc.
Any suggestions?