I'm using boost 1.33 and recently tried to build the signals dll using the darwin toolset. I then created a simple Xcode project called TestSignals to test it was working correctly. The project only contains the maximum.cpp example file (/boost-root/libs/signals/examples/maximum.cpp) linked against the signals dynamic library. The project builds just fine, but when I run the app, Xcode crashes with: "TestSignals has exited due to signal 10 (SIGBUS)." Here is a piece of the crash log (I can send the full log on request): --- Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000000 Thread 0 Crashed: 0 maximum.ob 0x0040c844 std::less<int>::operator()(int const&, int const&) const + 48 (stl_function.h:227) --- I tried using different example files, and they all crash. The library is built multithreaded and I do define BOOST_SIGNALS_DYN_LINK in my project. I'm running on Tiger 10.4.2 using Xcode 2.1. Has anyone tried this or run into a similar problem? Thanks, Chiedo