I was working on this project the other day, and I finished it and exported to h.264 for sharing. It was only supposed to be a sample video clip so the original videos were to be used for a bigger project, but now when I open the project file and try to play any of the videos I recorded with my T2i, except for a time lapse which is raw video, FCPX spits out a black screen. Obviously I was able to work on them and export them, but I checked out my backup logs and apparently less than 1 hour after the export, the movie files were corrupted. I was uploading the h.264 exported video then, so this leads me to believe that somehow FCPX corrupted my video files. This was causing all sorts of errors including crash on startup due to a failure to render previews, unable to open project, etc. and the video files cannot be opened with any video player, including but not limited to QuickTime, MPlayerX and VLC. The timestamp, resolution, audio and all other information about the videos are all intact. FCPX still reports that the videos are 1080p, stereo audio, 30fps video with the correct timestamp. Can anyone help?