I wanted to start a new thread just to make sure people read it ... As some have noticed I experienced major problems upgrading vegas 4 to 5. I have found the problem and isolated it,, when I finally got vegas running but it wouldn't capture video I decided to uninstall my control surface ,sound card (tascam Us -428) and revert back to the generic sound card ESS Allegro,,That fixed it ,,simple,, it's as clear as night and day, my video preview is clear and I can capture video.....(. I noticed others were experiencing similar problems..) maybe this might point them in a direction.......To add on to this ,,the conflict between the tascam and video capture seems to be bandwith related,, maybe IRQ conflict?