IMovie flashes black (missing frames) on output only

Anyone run into this problem? The project is fine when I preview it, but when I export it (or send it directly to YouTube) it comes up with missing frames (black frames.) It just flashes to black intermittantly with the missing frames.
Very strange ... thanks for any and all help!

The same thing happens to me and have no idea why, the other videos ive made have come out good but since this one had more videos than pictures, it flashes a black screen but cant find no where how to fix that.

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