iMovie Project Gone After Crashed Export

The good news is that your project is still intact in the iMovie library. Apparently when the crash occurred the link to it was broken.

In that you have already tried deleting preferences with no success, try booting up in Safe Mode (see Finder

menu for instructions) and, after everything loads, immediately shut down and reboot in normal mode. Then see if iMovie works properly. Don't try to open iMovie while in Safe Mode because it won't open there.

You can also try redownloading iMovie. To update/redownload iMovie 10, drag your iMovie 10 app from the Applications folder into the trash, but do not empty the trash. Sign in to the app store and open your purchases folder by clicking on your name at the bottom of the app store side bar. You will see your purchases displayed, including iMovie 10. Redownload/update iMovie from there. If not successful, drag your present iMovie app out of the trash and return it to the Applications folder. However, the download should be successful. Then see if the redownload re-established the link to your project.

If the above doesn't work, you can try creating a new library and copy your project from the Show Package Contents of your project's library into the Show Package Contents of the newly created library. Then try opening the project in the newly created library.

-- Rich