My iMovie is frozen
My iMovie is frozen, unable to open for anew project
MacBook Pro 13″, macOS 10.13
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Try shutting down your Mac and then booting up in Safe Mode. After
everything loads, immediately shut down and reboot in normal mode. Then see if
you can open iMovie .
Start up your Mac in safe mode - Apple Support
If still no luck, try opening iMovie in a new library. Hold down the Option key while opening iMovie. Create a new library in the box that appears, and iMovie will (hopefully) open in that library.
If still no luck, redownload 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. Now see if iMovie will open. If not successful, drag your present iMovie app out of the trash and return it to the Applications folder.
-- Rich