Preview in iMovie suddenly stopped working

I was working on a project, and suddenly the preview window, on te right stopped working.
I can't edit the project anymore, can't view it, can't export it, ..
I tried a lot of thing, like reinstalling imovie, moving the files, rebooting, ...
Nothing seems to work
Help me out please
PS: previewing imported clips does work

Cool! I've been seeing a lot of messages on the iMovie Discussion Group with similar symptoms. And one of the newer contributors to the list (calbe) kept recommending doing this step, of moving the last project out of the folder. And to my surprise it worked consistently. So now I'm recommending it to anyone who has a crash, lockup or any kind of Force Quit that then leads to iMovie being completely unstable afterwards.
And if you have the time or interest, as a further preventative measure you can also try moving the iMovie Preference file out of the Library. This forces iMovie to create a new preferences file. The benefit would be that Preferences file is notorious for causing problems after a Force Quit sometimes. To find the preference file go to the Mac Desktop and choose the Go Menu > *Hold down the Option key (this reveals the Library folder), click on Library (it appears grayed out but you can click on it. Inside of the Library>Preferences>com.apple.iMovieApp.plist (drag that file to the trash or the desktop). Make sure you have quit iMovie before doing this step, after you move the preference .plist file, open iMovie and make sure all your Events/Projects are visible and you can skim them with photos, titles all showing up.
Deleting the iMovie preferences file is not a requirement but more a preventative measure to keep iMovie humming along.

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