I'm trying to figure this out and I've gone through 'Energy Saver' settings and turned off 'Put the hard disk(s) to sleep when possible' but sometimes - not reliably, playback of a video file just pauses and then resumes as normal after about 10 seconds. It happened just the same with QT and Perian under Leopard and now happens in Snow Leopard too. Similarly, this sort of oddness happens with playback on VLC too. I'm confused. Help...?