iMovie crashes on startup

I've just installed iMovie from the App Store. When I run it, it crashes after the Welcome wizard. I've rebooted, deleted and reinstalled, and the same thing happens each time.

I've tried opening with Cmd and deleting preferences, I've deleted everything in ~/Movies, ~/Library/Containers/com.apple.iMovieApp, it still crashes every time

2014 MBP, 16 GB RAM, just installed 10.13

There may be vestiges of old iMovie installs/projects laying around; if there are, I'm OK with completely deleting them, if someone can tell me how to hunt them all down

Crash report

Process: iMovie [1107] Path:
/Applications/iMovie.app/Contents/MacOS/iMovie Identifier:
com.apple.iMovieApp Version: 10.1.7 (310090) Build Info: iMovieX-31009000019000000~1 App Item ID: 408981434 App External ID: 823649006 Code Type: X86-64 (Native) Parent Process: ??? [1] Responsible: iMovie [1107] User ID: 501

Date/Time: 2017-10-01 19:33:44.776 -0500 OS Version:
Mac OS X 10.13 (17A365) Report Version: 12 Anonymous UUID:
1BAD87A2-DB4E-312A-643C-36D1F4BE862D

Time Awake Since Boot: 2600 seconds

System Integrity Protection: enabled

Crashed Thread: 4 Dispatch queue: com.apple.root.default-qos

Exception Type: EXC_CRASH (SIGABRT) Exception Codes:
0x0000000000000000, 0x0000000000000000 Exception Note:
EXC_CORPSE_NOTIFY

Application Specific Information: -[QCCGLRootContext minimalSharedContextForCurrentThread]: Inconsistent state abort() called HÇƱˇ

Solution 1:

I have a MBP that does this. Are you running an external display mirrored with the lid closed? Mine works if I open imovie with the lid up.

Solution 2:

With 10.13.2 it starts if you start it with lid open. After that you can close the lid or move the iMovie to external display.

Solution 3:

Had this same issue when High Sierra first came out, Apple support talked me through SafeBoot (which I couldn't do because I use a firmware password) and opening iMovie in a new user account (which it did). After much fiddling around iMovie did work again, but I cannot say which part of the process made it work.

Today iMovie doesn't work again, could be that the 10.13 update has broken it again. Will post back if I find a fix that works for me.