Aperture videos not playing smoothly in iMovie 11

My Aperture videos in iMovie are not playing smoothly. They do play fine when they are in a iMovie project, just not when previewing. It is choppy.
Everything was working fine with iPhoto11 and iMovie11.
Any ideas for a solution?

Try trashing the iApps preference file. For instructions, see this post.
https://discussions.apple.com/docs/DOC-4061

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