Did you get any help with this? I’m experiencing the same problem and it’s never happened before. I’m using GCP 5.1. When I drag a .mov file into a project, or import it from within FCP, I get a general error saying file type not recognized. Then the file on my hard drive has no thumbnail, will not play, but the file size is the same. Somehow FCP is recoding the file so it cannot be accessed even though all the data is still there. Did you get any help, or does anyone else have the same problem or any ideas?