Occasionally, perhaps one out of 4 logins, when I'm panning the camera around sharply, 90 deg or so from my AV viewing direction SL hangs for a long time, often over 30 seconds, sometimes over a minute, occasionally it never comes back (or maybe I'm impatient). Normally I have no trouble panning and have a very acceptable frame rate. This has happened in several locations, but I think it started about 2 versions ago. I have no idea how to reproduce it, just panning around seems to not have any effect.