Don't upgrade. Upgrade has problems with shared stuff. Will not play some of my handbrake video.
My laptops did not get the upgrade and there's no issue. It looks like Apple has pulled the upgrade from their site as both laptops show no updates available.
I've rebooted, reinstalled, everything and still have problems with video and stability when trying to play video. Apple's support forum is full of hundreds of comments so I'm not alone.
I upgraded early this morning. My iTunes functions normally with all my Handbrake files, video, movies and everything else. It upgraded 18 apps today on my iPhone, all flawlessly. My music is intact and plays without issue. MBP 10.6.5. Just saying.
Apple just released firmware upgrades to their networking gear....time capsule, airport express, and airport base station. Just installed all and everything is back to normal. 10.1.1 was playing havoc with my internal LAN.
Phew.