Not sure what is going on as I haven't been able to replicate it consistently. And it could be my drobo running under lion. But HD movies that used to stream just fine, once I upgraded to Lion have started stuttering really bad. Rebooted the AppleTV and the computer and it cleared it up which makes very little sense to me. Then the next day it came back. I'll try rebooting everything tonight - router, comp, appletv, etc. And SD streams just fine. Just curious if anyone else having stutter problems.