Hi I have noticed that on Ubuntu my code that uses Boost Threads works fine when I throw exceptions (for example strings) and catch them in the same thread. But this doesn't seem to work on Windows XP with Mingw gcc 3.4.5. If I throw a exception in thread, the program crashes. Is there some known problem with Boost Thread and Mingw? I'm using Boost 1.37. Simple example: #include <exception> #include using namespace std; class callable { public: void run() { try { cout << "Throwing" << endl; throw string("error"); } catch(string &e) { cout << "Error: " << e << endl; } } void operator()() { this->run(); } }; int main() { callable c; boost::thread thrd(boost::ref(c)); thrd.join(); return 0; } Janne