IMovie '08 Thumbnails disappear

I am a recent Mac convert and defintley need some help figuring out how to troubleshoot anything on this machine.
When dragging clips longer than 5 minutes into the top (project?) screen all the thumbnails disappear... randomly. If I adjust the interval of the thumbnails (from 10s to 5s or from 10s to 30s, for example) they sometimes come back, but it is definitly not a reliable solution. In general it is a HUGE pain when editing my videos. i can drag my mouse over the area where the thumbnails used to be and it plays the video as if the thumbnails were there... but i can't see them. I'm left feeling around in the dark trying to drop my clips in the correct place. So frustrating!
Help!
I had this problem on a couple different machines, my brother's MBP and my new iMac. Is there a way to get rid of it for good, or am I going to need to upgrade to Adobe premier or final cut to avoid this ridiculous glitch?

I still have not downloaded the huge OS update. In the meantime the following (forcing iMovie to recreate the thumbnail files from scratch) may help (I had some slightly different problems so dont count on it):
Close iMovie.
Go to the Movies folder for the user with the missing thumbnails. Go to the iMovie Events folder and then the specific Event folder for the event(s) with the corrupted thumbbails. There should be a "Thumbnails" folder - move this (ont delete it yet kust in case this does not work).
When you restart iMovie it will spend a few minutes (or more if you had a lot of clips) recreating the thumbnails.

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