Projects thumbnails disappearing?

Using iMovie 08, after I've been working awhile on a project by dragging and dropping clips from the events browser into the projects browser, the thumbnails for the project don't show up. It's a completely grey area in the thumbnails section of the project.
It can be remedied by fiddling with the slider at the bottom of the project pane that adjusts the size/length of the thumbnail, but only after sliding it back and forth for quite awhile and then it's not always at the size I want then.
Another semi-remedy has been to click on another project for awhile and then click back to my first project. Doesn't always work, however.
I'm thinking maybe it only happens to the longer projects, although I haven't made anything over 20 minutes ever (and do want to go longer eventually)?
VERY frustrating.
Any ideas why it has started doing this and help as to how to fix it?
Thanks, Deborah

This seems to be a problem that occurs when memory gets too full and there are too many swap files all at once. A quick solution is to Quit iMovie and restart it. (This resets the iMovie swap files and frees them from memory). It will work even better to reboot your Mac (this resets all swap files). You also may want to consider purchasing additional memory.
There is a free utility that you can get for your Mac that lets you see the state of your swapfiles. It is called Memory Stick. It is available here. When you notice that you have 6 or more swapfiles and you are doing a lot of paging in and out, it is probably time to either reboot or buy more memory,
http://www.tidbits.com/matt/

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