UE 4.14 is not work too,
is UE4.15 not support Mac Pro 3,1 ?
here is bug info
LoginId:2d23cf4c8643ac283a82708a28aca0f4
EpicAccountId:1264339815394dc99b152e547cc90c72
SEGV_MAPERR at 0x3
FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x10e7dd44b (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x10e9a22d8 (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0x10ea84197 (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x10e9fd196 (filename not found) [in UE4Editor-Core.dylib]
FMetalDeviceContext::CreateDeviceContext() Address = 0x14c2d0d99 (filename not found) [in UE4Editor-MetalRHI.dylib]
FMetalDynamicRHI::FMetalDynamicRHI(ERHIFeatureLevel::Type) Address = 0x14c30b39b (filename not found) [in UE4Editor-MetalRHI.dylib]
FMetalDynamicRHIModule::CreateRHI(ERHIFeatureLevel::Type) Address = 0x14c30b254 (filename not found) [in UE4Editor-MetalRHI.dylib]
PlatformCreateDynamicRHI() Address = 0x114776e41 (filename not found) [in UE4Editor-RHI.dylib]
RHIInit(bool) Address = 0x114778335 (filename not found) [in UE4Editor-RHI.dylib]
FEngineLoop::PreInit(wchar_t const*) Address = 0x10e6dcbc5 (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0x10e6f08d1 (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0x10e6fe53c (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0x10e92e366 (filename not found) [in UE4Editor-Core.dylib]
Unknown() Address = 0x7fffbbf6fc6d (filename not found) [in Foundation]
_pthread_body Address = 0x7fffcfd40aab (filename not found) [in libsystem_pthread.dylib]
_pthread_body Address = 0x7fffcfd409f7 (filename not found) [in libsystem_pthread.dylib]
thread_start Address = 0x7fffcfd401fd (filename not found) [in libsystem_pthread.dylib]