HI: This may be similar to what happens to me with Premeire 7.0 if I don't remove the capture device cable, or shut it off before I start to playback. The software wants to playback in the camera or my JVC Deck, not in the edit windows. Preferences have no control over this problem...just past experiences of mine...I still occasionally forget, but it has stumped me so often that I know automatically now what to do. hope this info is what you need to know. :