MacOSX Crash after hitting the "Play" button


I just downloaded UE4, and the editor works correctly until I hit “Play”. Then it crashes and exits. I’ve checked if it was the USB device bug by disconnecting all USB devices to no avail.

I’ve also been searching in the forums, but I have not been able to find anything about it. My system is a MacBook Pro (probably below the specs, but the editor works) with Mavericks (10.9.2). It seems to be related to something with audio, but I can’t find anywhere in the forums or in the answerhub anything about it.

I include the logs in this post, here are the first lines of both of them. First, the basic template:

Thread 0 Crashed:: Dispatch queue:
0   dyld                          	0x00007fff6c5ec09d dyld_fatal_error + 1
1   dyld                          	0x00007fff6c5eedf6 dyld::fastBindLazySymbol(ImageLoader**, unsigned long) + 171
2   libdyld.dylib                 	0x00007fff8f16b2dd dyld_stub_binder_ + 13
3   ???                           	0x00000001080df008 0 + 4430098440
4   UE4Editor-CoreAudio.dylib     	0x0000000113a69711 FCoreAudioSoundBuffer::CreateQueuedBuffer(FCoreAudioDevice*, USoundWave*) + 257
5   UE4Editor-CoreAudio.dylib     	0x0000000113a6cae2 FCoreAudioSoundSource::Init(FWaveInstance*) + 66
6   UE4Editor-Engine.dylib        	0x00000001064f0d70 FAudioDevice::StartSources(TArray<FWaveInstance*, FDefaultAllocator>&, int, bool) + 944
7   UE4Editor-Engine.dylib        	0x00000001064f1517 FAudioDevice::Update(bool) + 1287

And this one is for the Flappy Bird clone:

    Thread 0 Crashed:: Dispatch queue:
    0   dyld                          	0x00007fff5fe3e09d dyld_fatal_error + 1
    1   dyld                          	0x00007fff5fe40df6 dyld::fastBindLazySymbol(ImageLoader**, unsigned long) + 171
    2   libdyld.dylib                 	0x00007fff8f4b52dd dyld_stub_binder_ + 13
    3   ???                           	0x0000000106dd3008 0 + 4410126344
    4   UE4Editor-Engine.dylib        	0x00000001051d7532 FAsyncVorbisDecompressWorker::DoWork() + 114
    5   UE4Editor-Engine.dylib        	0x0000000105201774 FAsyncTask<FAsyncVorbisDecompressWorker>::Start(bool) + 228
    6   UE4Editor-Engine.dylib        	0x00000001051e63be FAudioDevice::Precache(USoundWave*, bool, bool) + 718
    7   UE4Editor-CoreAudio.dylib     	0x00000001127f2cf3 FCoreAudioSoundBuffer::Init(FAudioDevice*, USoundWave*, bool) + 163

Has anyone had this same problem?


Hi again,

It seems that nobody else has this problem, or at least I couldn’t find any information about it. Is there an official email address where I can ask Epic about this bug?

Thanks again,


I just downloaded 4.1 and it crashes exactly the same way. Is it me only or does it happen to anyone else?


Hey kikesantos,

I apologize for the delay in response, this post got lost and we’re just finding it now. Are you still experiencing this issue after updating to 4.2.1? If so, could you include your system specs? You can find that information by going to About This Mac > More Info. Thanks!

Ben Halliday

Hi Ben,

I’ve not updated to 4.2.1, as I cancelled my subscription (I couldn’t use the editor at all). I’m going to repurchase the subscription soon (I just got a Windows PC with a beefier GPU) so I may download it just to try and see if it keeps happening. If it does I’ll post the results in here.


Glad to hear you’re going to give it another try with your new system. I suspect your Mac was under spec by enough to not launch properly, as I’ve seen that happen with other Mac users. Let us know how things go with the PC!