iMovie 9.0.6 and 9.0.7: iMovie unexpectedly quits after opening
After updating to iMovie version 9.0.6 or 9.0.7, iMovie unexpectedly quits immediately after opening.
If you are currently using iMovie version 9.0.6 or 9.0.7, updating to iMovie version 9.0.8 may resolve the issue. You can do this by choosing Software Update or App Store from the Apple () menu, and then installing any iMovie updates that are listed.
For more information, go to About iMovie 9.0.8 and 3ivx software.