UnrealEngine 4.15.1 C on launch (Displacement+Metal 1.2)

Hi everyone,
The engine crashed yesterday and since it crashes 10-15 seconds after launch even if I don’t do anything.
The callstack seems to be always the same and maybe related to using the latest version of Apple Metal on this project. OS is updated to 10.12.5

Here’s the stack, thanks for any help:


FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x104f6944b (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x10512e2d8 (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, …) Address = 0x105210197 (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, …) Address = 0x105189196 (filename not found) [in UE4Editor-Core.dylib]
ReportMetalCommandBufferFailure(id, wchar_t const*) Address = 0x13c17e3cf (filename not found) [in UE4Editor-MetalRHI.dylib]
MetalCommandBufferFailureInternal(id) Address = 0x13c1ff9dc (filename not found) [in UE4Editor-MetalRHI.dylib]
HandleNVIDIAMetalCommandBufferError(id) Address = 0x13c17cf15 (filename not found) [in UE4Editor-MetalRHI.dylib]
_doMTLDispatch Address = 0x7fff859b4334 (filename not found) [in Metal]
-[_MTLCommandBuffer didCompleteWithStartTime:endTime:error:] Address = 0x7fff859b543d (filename not found) [in Metal]
-[MTLIOAccelCommandBuffer didCompleteWithStartTime:endTime:error:] Address = 0x7fff8597ee5d (filename not found) [in Metal]
-[_MTLCommandQueue commandBufferDidComplete:startTime:completionTime:error:] Address = 0x7fff859b977b (filename not found) [in Metal]
__53-[MTLIOAccelCommandQueue submitCommandBuffers:count:]_block_invoke.27 Address = 0x7fff85993fa5 (filename not found) [in Metal]
ioAccelCommandQueueBlockFenceCallback Address = 0x7fff90e319b0 (filename not found) [in IOAccelerator]
IODispatchCalloutFromCFMessage Address = 0x7fff8403d6e2 (filename not found) [in IOKit]
_IODispatchCalloutWithDispatch Address = 0x7fff8403d761 (filename not found) [in IOKit]
dispatch_mig_server Address = 0x7fff9783154b (filename not found) [in libdispatch.dylib]
_dispatch_client_callout Address = 0x7fff978238fc (filename not found) [in libdispatch.dylib]
_dispatch_continuation_pop Address = 0x7fff97838a16 (filename not found) [in libdispatch.dylib]
_dispatch_source_latch_and_call Address = 0x7fff9782ea6c (filename not found) [in libdispatch.dylib]
_dispatch_source_invoke Address = 0x7fff9782613b (filename not found) [in libdispatch.dylib]
_dispatch_queue_serial_drain Address = 0x7fff978397db (filename not found) [in libdispatch.dylib]
_dispatch_queue_invoke Address = 0x7fff9782c306 (filename not found) [in libdispatch.dylib]
_dispatch_root_queue_drain_deferred_item Address = 0x7fff9783a24c (filename not found) [in libdispatch.dylib]
_dispatch_kevent_worker_thread Address = 0x7fff9783d27a (filename not found) [in libdispatch.dylib]
_pthread_wqthread Address = 0x7fff97a7247b (filename not found) [in libsystem_pthread.dylib]
start_wqthread Address = 0x7fff97a7207d (filename not found) [in libsystem_pthread.dylib]
Unknown() Address = 0x61800083b900 (filename not found) [in ???]

The problem is definitely linked to displacement, as removing all displaced material stopped the crash.