Imovie not playing back video from one event

Select vidoes in iMovie '09 won't play back for me.  All I get is a black box, no audio, no video.  The issue appears to be confined to videos from one particular event.  The preview shows up just fine, but no actual video. 
The videos were taken and imported from the same Sony camera as the videos that do work.  They also play back fine in Quicktime.  The format is .mov.  Any ideas?

Fixed the issue myself. Here's a step-by-step because I what found online pertaining to this issue were not clear on how to fix it.  (Note that this is what I did to fix the problems, some of the steps might not be strictly necessary.)
How to get movies to start playing back again in iMovie '09: 
1.) Close iMovie.
2.) Delete contents of the "iMovie Cache" folder for the event that is not playing back correctly.
         - There are were two files "Cache.mov" and "Cache.plist", I deleted both.
3.) Restart iMovie
This appeared to force the program to generate new files and start working correctly.  From what I read on other postings it was probably caused by the program not closing properly, which I seem to recall it crashing on me or my wife a while ago.
@ Bengt Wärleby
I appreciate you taking the time to post a reply, but please try to read the question before you do so in the future.  I had said that files imported from the same camera work correctly (i.e. the same file type/codec), so the problem is obviously not a codec issue.  Furthermore, .mov is the extension for the QuickTime File Format (http://en.wikipedia.org/wiki/.mov). 

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