I have two clients, a couple, who both have Macbooks. The husband's harddrive was acting up, so he backed up his files with an external harddrive (A WD he bought from the Apple store). One of the big things he backed up was an iMovie file. When we open that file, or any of his old iMovie files, on the wife's computer from the external, the same small, 3-second video is on every iMovie project file, despite differences in names and file sizes (one file, presumably the one that clip really belongs to, is 8kb, while the other is 1.2gb, but both have the same content, with the 1.2gb file's original content missing). Even I found this odd. Any ideas?