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Apple have released a recent update to FCPX, 10.2.3 which fixes lots of issues like this. I would recommended this update first as it has solved crashing issues for me. Sometimes FCPX doesn't like it when your library is saved separately to user/movies/ perhaps try moving the library there and see if it helps. ...


Instead of using a crossfade transition effect, use opacity keyframes in the video animation menu. Select your clip and press "control + v".

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