Ive been using vegas platinum 7 for a while and its fantastic. Ive done dozens of projects with no problems. This time is different. I bring AVI clips in. trim them on the timeline and arrange them. I save the project and when I close and reopen it, some of the clips are gone. The area is there but it is green, and when played the screen is green. But only on some videos. I havent moved the parent videos, all is the same, its just that about half of the videos are gone. They appear green on the timeline, and green during playback. This has never happened before, and I hope I havent just lost 10 hours of work. Please help.