I'm trying to edit a music video that I shot on my canon 7d last week. I'm using FCP 6.0 as well as my 15 inch mac book pro (4gb ram). I wasn't having a problem editing, until last night. the footage will hardly play back for longer than 2 seconds without freezing up. I do have some color correction on the footage but I wouldn't think that would be a problem? I'm also editing off a 500gb external drive connected by firewire 800. Any advice would be much appreciated thanks!