I have been seeing this ever since the last update but I have finaly managed to figure out how to make it happen. My bug report is already sent but this is a rather visualy cool bug and more pictures can always help solve a problem. When you have your camera far away from your avatar in a crowded place the culler starts to get a little to enthusiastic.
http://img170.imageshack.us/my.php?image=snapshot0096rm.jpg
Nothing to impressive here. Just a little overzealousness. There were six or so people in the room.
http://img201.imageshack.us/my.php?image=gap0015ym.jpg
A little to much culling if I do say so myself. There were around 20 or so people in the welcome area then.
http://img387.imageshack.us/my.php?image=snapshot0104eo.jpg
Now this is just over the top. It has culled of three forths of the screen including what I was standing on. This happend when the WA had 30+ people in it. If you can't tell this one was taken in the WA to.
Now if I return my view to something a little more human in scale the objects and such will start reloading again with now major harm done except to my bandwidth.