Hi everybody, this probably isn't asked for the first time, but I really find no solution: I own a new Unibody MacBook Pro, 2.4 GHz, 4GB RAM. It doesn't play iTunes Store HD videos and Apple 720i and 1080i trailers smoothly. Playing these kind of videos with Quicktime doesn't produce real hickups or something like that, but the picture also doesn't flow perfectly "fluent" (don't know if this is the correct word in English ...). I can play 1080i videos with VLC perfectly fine. I have the newest Quicktime version and the CPU isn't even maxed out when playing the files. No other big programs running. The better graphic card of the MacBook Pro is turned on. I need to watch my iTunes Store HD purchases and the Apple trailers with iTunes/Quicktime, so does anybody have a clue why it doesn't work perfectly? The hardware should be more than enough to have no problems, doesn't it? Thanks in advance!!