Hi guys,
I have read through all the above posts as I am a beginner to editing and have had the same problem with CS3 on a dedicated work PC. I captured successfully a whole amateur feature film then, when I went back to do a rough cut and went to play back scenes to select the ones I wanted, they played for a second of visuals then stopped while the audio continued. I am NOT technical at all and so got confused by all the above. In the end, I went to EDIT/PREFERENCES/DEVICE CONTROL and selected NONE. Problem fixed!!