IMovie 10 import video flashes

Novice iMovie user here needing some help.   I'm using iMovie 10.
I've imported some video clips into iMovie, but when play them back, they now have like a repetitive flashing or jump about every 1/2 second. 
Playback the same clip with QuickTime and no problem.
Any ideas on cause and what I can do to correct?

Greetings kenfused,
After reviewing your post, it sounds like you want to change the date and time on some events. I would recommend that you read this article, it may be able to help the issue.
iMovie '11: Adjust the date and time of a video clip
Thanks for using Apple Support Communities.
Take care,
Mario

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