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Hi, i have a weird problem on my 3D shop Editor using Unigine. I'm using OSX mountain lion with the last version of Xcode. After the last release Unigine is completely compatible with clang, i rebuild all project with clang. And i have some very weird bug like : Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libunwind.dylib 0x00007fff8fd7fe9c libunwind::CompactUnwinder_x86_64<libunwind::LocalAddressSpace>::stepWithCompactEncodingFrameless(unsigned int, unsigned long long, libunwind::LocalAddressSpace&, libunwind::Registers_x86_64&, bool) + 548 1 libunwind.dylib 0x00007fff8fd7d5c0 libunwind::CompactUnwinder_x86_64<libunwind::LocalAddressSpace>::stepWithCompactEncoding(unsigned int, unsigned long long, libunwind::LocalAddressSpace&, libunwind::Registers_x86_64&) + 86 2 libunwind.dylib 0x00007fff8fd7d50e libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86_64>::step() + 58 3 libobjc.A.dylib 0x00007fff88d8b7af objc_addExceptionHandler + 79 The line that give me a problem are all acces to the window or context like : [app->window setTitle:string] in appwindow.mm [app->context makeCurrentContext] in glappwindow.mm If i use llvm+gcc4.2 the crash disappear. I have a lot of difficult for have more information about this crash.