Is anyone else experiencing problems with their Mac going to sleep properly after installing Perian? I find that when I have QuickTime open (even if a movie isn't playing) that my MBP neve goes to sleep. The problem seems to go away if I uninstall Perian. I find that some other applications also seem to keep my Mac from sleeping properly -- such as Paragon NTFS, Synchronize X!, etc. so it's probably not unique to Perian. I'm running OS 10.5.2.