iMovie 10.1.15 crashes and will not load my iMovie library

Try these diagnostic tools to see if you can solve the crashing issue. All of them are very easy to do.

Deleting

Preferences

Try opening iMovie while holding down the

Option and Command keys and selecting to delete preferences in the box that

appears. iMovie will open in a new library. Reopen your old library to get back

to your projects.

Safe

Mode

You could also 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.

Resetting

the System Management Controller

Try resetting the System Management

Controller:

https://support.apple.com/en-us/HT201295 

Resetting the NVRAM or PRAM

Try resetting the NVRAM or PRAM,

although this issue would be fairly rare:

https://support.apple.com/en-us/HT204063

-- Rich

There have been several glitches reported following the update to iMovie 10.1.15. According to one poster on this forum, Apple support acknowledged the glitches and said they hoped to have them fixed by the middle of next week. If the post is accurate, that would be about September 3, 2020.

If you have a Time Machine backup you possibly could restore your previous iMovie iteration.

Also, with an update iMovie can open in a new blank library. You should be able to close iMovie and go to your Movies folder (Go/Home/Movies) and double click on your old library's icon for IMovie to open in that library.

-- Rich

Good news that a fix is coming soon. iMovie 10.1.15 crashed as soon as I launched it. I tried deleting my most recent project but that initially made no difference. However, a few attempts later, iMovie launched successfully and I was able to use it. But, on some subsequent executions, it again crashed on launch. So, it's an intermittent, but frequent, fault. Very annoying. I look forward to that fix. (I'm running MacOS 10.15.6 (19G2021) on an almost new Mac Mini.)