IMovie not playing back edit master video on viewer

I recently dumped about 140GB of various clips into iMovie, and I hit a couple of snags and need some help.
First let's go with the easy question 1st. Is there way to categorize or arrange clips into groupings before you start editing? I'm sure there must be a Clip Bins option or something similar like in Final Cut and Adobe?
NOW THE MAIN PROBLEM...
Several of the movies I brought into iMovie play fine if you run them from events pane, but if you make even the smallest edit and try to run the edited footage, there is nothing. The screen is black, and the play head won't move at all. What's up with that? The original footage and thumbnail files seem to run fine on their own.
Please help

for organization you may or may not find this thread helpful:
http://discussions.apple.com/message.jspa?messageID=11230385#11230385
but make sure you read Applemans response as he has a program that makes what I was describing easier.
don;t know about your "Main Problem"
rr

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@ Bengt Wärleby
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IMovie not playing back edit master video on viewer

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