Hi - I have been working on editing a lecture. I added a few clips and now the video is not visible. When I click 'tracks' the video1 track is greyed out. I can't figure out how to get the video back. The audio plays and I can see the slides in the video track but they don't play. I don't want to delete as I did a lot of time consuming editing. I really hope I can get that video track active again. Thanks for any advice.