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try movin the project to a diff file in iMovie completely reset the .plist files for iMovie and stuff.. other than that... im not sure 😕 use a diff accouunt maybe?
 
I don't think those will help the issue as it's something screwy in the movie's encoding.
 
must've been something with the camera flashes in the clips messing with imovie's encoding, based on the timing of the flickering. anyway, i used the "black reflection" theme instead and no flickers!
 
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