Comment 6 for bug 1073844

I think I worked around the issue. I re-imported 09102012012_stabilized.mp4 (which is the file where the project got broke) and all thumbnails came back. I guess any other project file would have done it, too. I right-clicked the depending thumbnail and chose "Remove from project". The thumbnail and the clip on the track disappeared and all other clips and tracks cam back. The saved project file (attached) is now properly loadable (although I did not include 09102012012_stabilized.mp4 again yet).

Nevertheless I think it should be a major issue that a project file can break.