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I FIGURED IT OUT!! This looks to be a bug in Unity - without an input device (microphone) Unity crashes. I was attempting to change audio settings on my Mac Mini to see what I could do (turns out there is not much to change on a Mac - big surprise) and I noticed I had no input devices listed. On a whim, I plugged in an old set of headphones into the audio input jack on the back of the Mini. OS X detected the headphones and an input device was listed and... KSP started! This fixed Besiege, City Skylines and KSP!! How do I submit this problem to Unity??

Same thing here! And I have the same crash dump when I try to start Besiege on my Mac. I've turned the Steam Overlay off and removed and reinstalled both games and I get the same crash at startup. In Besiege: Thread 0 Crashed:: MainThrd Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x00007fff836da002 __pthread_kill + 10 1 libsystem_pthread.dylib 0x00007fff89e8a5c5 pthread_kill + 90 2 libsystem_c.dylib 0x00007fff815b46e7 abort + 129 3 libmono.0.dylib 0x0000000101ef2022 mono_handle_native_sigsegv + 732 4 libmono.0.dylib 0x0000000101f39b5f sigabrt_signal_handler + 100 5 libsystem_platform.dylib 0x00007fff90918eaa _sigtramp + 26 6 dyld 0x00007fff6e41f4f2 ImageLoaderMachO::getExportedSymbolAddress(ImageLoader::Symbol const*, ImageLoader::LinkContext const&, ImageLoader const*, bool) const + 36 7 libsystem_c.dylib 0x00007fff815b46e7 abort + 129 8 unity.Spiderling Games.Besiege 0x0000000100a29a14 HandleSignal(int, __siginfo*, void*) + 36 9 libmono.0.dylib 0x0000000101f3976a mono_chain_signal + 71 10 libmono.0.dylib 0x0000000101e86c47 mono_sigsegv_signal_handler + 213 11 libsystem_platform.dylib 0x00007fff90918eaa _sigtramp + 26 12 ??? 0x0000000000000100 0 + 256 13 unity.Spiderling Games.Besiege 0x0000000100ca55b7 SampleClip::LoadBaseSound() + 503 14 unity.Spiderling Games.Besiege 0x0000000100ca6b4b AudioClip::CreateSound() + 379 15 unity.Spiderling Games.Besiege 0x0000000100ca7c5c AudioClip::AwakeFromLoad(AwakeFromLoadMode) + 60 And KSP: Thread 0 Crashed:: MainThrd Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x00007fff8e816f06 __pthread_kill + 10 1 libsystem_pthread.dylib 0x00007fff990d04ec pthread_kill + 90 2 libsystem_c.dylib 0x00007fff8568d6e7 abort + 129 3 libmono.0.dylib 0x0000000101a83fe1 mono_handle_native_sigsegv + 723 4 libmono.0.dylib 0x0000000101ad0b21 sigabrt_signal_handler + 97 5 libsystem_platform.dylib 0x00007fff846b552a _sigtramp + 26 6 ??? 0x00000001014ebf19 0 + 4316905241 7 libsystem_c.dylib 0x00007fff8568d6e7 abort + 129 8 unity.Squad.Kerbal Space Program 0x0000000100a4cc84 HandleSignal(int, __siginfo*, void*) + 36 9 libmono.0.dylib 0x0000000101ad0749 mono_chain_signal + 75 10 libmono.0.dylib 0x0000000101a154e1 mono_sigsegv_signal_handler + 210 11 libsystem_platform.dylib 0x00007fff846b552a _sigtramp + 26 12 ??? 0x000000010148e0a8 GetPreallocatedMemory(int)::g_MemoryBlockForMemoryManager + 7096 13 unity.Squad.Kerbal Space Program 0x0000000100cd4cfc SampleClip::LoadBaseSound() + 476 14 unity.Squad.Kerbal Space Program 0x0000000100cd6226 AudioClip::CreateSound() + 422 15 unity.Squad.Kerbal Space Program 0x0000000100cd728c AudioClip::AwakeFromLoad(AwakeFromLoadMode) + 60 Pretty much the same! Why is loading sound at the beginning of the game causing a crash???