Zippy,
I was wondering if you ever solved the problem with freezing that you were having when playing certain CPU intensive clips. That thread was back in August.
I seem to be having the same problem. It only occures on full res previews which I didn't used to use because I couldn't fit it on the monitor. I haven't decided yet if it is a CPU overload problem or a HD overload problem. Maybe it's an IDE buss mastering problem. I don't know.
I do know that on my old system I could run full res and it would just slow the preview down to 1 or 2 fps. Not freeze the interface. This system is 3 times faster and shouldn't be freezing simply from lack of power.
JBJones