There have been several reports of this over in Xamarin forums, and it's still hitting us. Our App will launch fine from Finder, command line, or under lldb. But when launched from Xcode6/7 on ElCap the app crashes as follows:
FWIW: Here's what we see with our ElCap crash:
(lldb) monobt
* thread #1
frame #0: 0x121d8653d (wrapper managed-to-native) object:__icall_wrapper_mono_object_new_fast (intptr) + 0x7d (0x121d864c0 0x121d8654e) [0x11a036840 - .]
* frame #1: 0x0000000107e881e9 libmonosgen-2.0.1.dylib`mono_jit_runtime_invoke(method=<unavailable>, obj=0x0000000000000000, params=0x0000000000000000, exc=0x000000011a977968) + 1641 at mini.c:6683
frame #2: 0x000000010803596e libmonosgen-2.0.1.dylib`mono_runtime_invoke(method=0x000000011a931e38, obj=0x0000000000000000, params=0x0000000000000000, exc=0x00007fff5fbfe860) + 110 at object.c:2862
frame #3: 0x0000000108035e6e libmonosgen-2.0.1.dylib`mono_runtime_class_init_full(vtable=0x000000011a977838, raise_exception=0) + 798 at object.c:384
frame #4: 0x0000000107e856b5 libmonosgen-2.0.1.dylib`mono_jit_compile_method_with_opt [inlined] mono_jit_compile_method_inner(method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, method=0x000000011a72d7b0, opt=<unavailable>) + 994 at mini.c:6164
frame #5: 0x0000000107e852d3 libmonosgen-2.0.1.dylib`mono_jit_compile_method_with_opt(method=<unavailable>, opt=<unavailable>, ex=0x00007fff5fbfeb98) + 2851 at mini.c:6244
frame #6: 0x0000000107e87cfa libmonosgen-2.0.1.dylib`mono_jit_runtime_invoke(method=0x000000011a72d7b0, obj=0x0000000000000000, params=0x00007fff5fbfee38, exc=0x0000000000000000) + 378 at mini.c:6519
frame #7: 0x000000010803596e libmonosgen-2.0.1.dylib`mono_runtime_invoke(method=0x000000011a72d7b0, obj=0x0000000000000000, params=0x00007fff5fbfee38, exc=0x0000000000000000) + 110 at object.c:2862
frame #8: 0x000000010803b138 libmonosgen-2.0.1.dylib`mono_runtime_exec_main(method=0x000000011a72d7b0, args=<unavailable>, exc=0x0000000000000000) + 376 at object.c:4119
frame #9: 0x00000001000acff2 MyApp`DotNet::Init(runtimeVersion=0x0000000100c19c64) + 674 at DotNetMac.cpp:87
frame #10: 0x000000010002e591 MyApp `MyApp::PostInitApplication(this=0x00007fff5fbff4c8, appInitArgs=0x00007fff5fbff628) + 2577 at MyApp.cpp:472
frame #11: 0x000000010002d9a4 MyApp `MyApp::InitApplication(this=0x00007fff5fbff4c8, appInitArgs=0x00007fff5fbff628) + 164 at MyApp.cpp:427
frame #12: 0x0000000106549c7d MyApp `AppBase::Initialize(this=0x00007fff5fbff4c8, inAppInitArgs=0x00007fff5fbff628) + 2221 at AppBase.cpp:248
frame #13: 0x000000010000272c MyApp `RunApp() + 428 at MyApp.cpp:51
frame #14: 0x0000000100002513 MyApp `main(argc=3, argv=0x00007fff5fbff6c0) + 51 at Muse.cpp:70
frame #15: 0x00007fff85a8f5ad libdyld.dylib`start + 1
