I've used earlier versions of Vegas and they were smooth. Pro 9 is giving me some jerky, stuttering, frame-skipping preview, mostly during transitions. I've tried fiddling with the amount of memory allocated to preview, number of processors, Draft mode in preview, etc. nothing seems to help, though I've noticed it seems that if I just keep replaying the same segment several times it gets smoother. It is especially bad when I am using TIFF images, which I suspect is due to their file size. I didn't seem to have this problem using Pro 8 (and I was using both the 32 and 64 bit version). I am running Vista Business 64 bit on a box with 8GB memory, 2 quad core 3.1 mhz Intel processors (8 total processors). Video card is Nvidia 3200 or 4500, I forget...I think it has 512mb memory....  Any thoughts, tips or ideas?

