With any luck, this will help.
Late Tuesday, Apple released version 10.0.4 of its iMovie editing suite. The new version, which can be downloaded via OS X’s Software Update feature, adds the following fixes and changes:
– Improves stability and resolves issues that could cause iMovie to quit unexpectedly
iMovie 10.0.4 requires an Intel-based Mac running OS X 10.9.2 or late to install and run.
If you’ve tried the new version and have any feedback to offer, please let us know in the comments.