How do I fix this glitch when I open iMovie?

After using iMovie for about an hour I decided to use the voiceover option. I successfully used it but about 1 minute after it got stuck loading and this happened. WHAT DO I DO? my computer background is like that exactly but you can see the files on top of it. I changed the background in the settings and it went back to normal but I can't use iMovie without this happening!

This looks like a redraw error due to the graphics card not being fast enough.  I get this on a second monitor on my Mac Mini (late 2010) from time to time but it corrects itself after a few seconds and deos not affect the project or stop me from being able to edit.
Is your exmple from a second monitor by any chance?
Geoff.

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