iMovie crash on macOS High Sierra

Hi,

Since macOS High Sierra (french), iMovie (10.1.7) keeps crashing. Each time.

I've tried deleting my default library, no change

I've seen here how to reset preferences : holding down Control+Option key on imovie startup. I did it.

- It loads

- It asks me if I want to delete preferences (and waits):

- I say : no, it crash

- I say : yes, it loads and displays the welcome screen(s) and when I click "Start", it crash

Trace:

Process: iMovie [3920]

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 [3920]

User ID: 501

Date/Time: 2017-10-11 11:20:02.097 +0200

OS Version: Mac OS X 10.13.1 (17B25c)

Report Version: 12

Anonymous UUID: C70E7638-1D33-346D-DD93-119A90E23816

Sleep/Wake UUID: 4A8C1BA9-57A3-430A-8D86-8E1E6E3D7205

Time Awake Since Boot: 38000 seconds

Time Since Wake: 12000 seconds

System Integrity Protection: enabled

Crashed Thread: 5 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

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Application Specific Backtrace 1:

0 CoreFoundation 0x00007fff3046f18b __exceptionPreprocess + 171

1 libobjc.A.dylib 0x00007fff5717bc76 objc_exception_throw + 48

2 CoreFoundation 0x00007fff3046f0d9 -[NSException raise] + 9

3 QuartzComposer 0x00007fff3af15672 GFException + 278

4 QuartzComposer 0x00007fff3af185b3 GFThrowException + 292

5 QuartzComposer 0x00007fff3aebe97f -[QCCGLContext minimalSharedContextForCurrentThread] + 243

6 QuartzComposer 0x00007fff3aebe55f -[QCOpenGLContext startRenderingPatch:options:] + 61

7 QuartzComposer 0x00007fff3aeecdb8 -[QCRenderer initWithRenderingContext:patch:] + 374

8 QuartzComposer 0x00007fff3af6344a -[QCRenderer initOffScreenWithPixelFormat:size:colorSpace:patch:] + 1078

9 QuartzComposer 0x00007fff3af6385b -[QCRenderer initOffScreenWithSize:colorSpace:composition:] + 155

10 Flexo 0x0000000101afa691 -[FFIMTrailerInfo newThumbnailOfSize:] + 1361

11 Flexo 0x0000000101afa817 -[FFIMTrailerInfo thumbnail] + 71

12 Flexo 0x0000000101afa9d0 __50+[FFIMTrailerInfo preloadThumbnailsForTrailerIDs:]_block_invoke + 272

13 libdispatch.dylib 0x00007fff57d386cd _dispatch_call_block_and_release + 12

14 libdispatch.dylib 0x00007fff57d30e88 _dispatch_client_callout + 8

15 libdispatch.dylib 0x00007fff57d3dda5 _dispatch_queue_override_invoke + 880

16 libdispatch.dylib 0x00007fff57d32a7a _dispatch_root_queue_drain + 515

17 libdispatch.dylib 0x00007fff57d32826 _dispatch_worker_thread3 + 101

18 libsystem_pthread.dylib 0x00007fff57ff41ca _pthread_wqthread + 1387

19 libsystem_pthread.dylib 0x00007fff57ff3c4d start_wqthread + 13