http://blogs.msdn.com/b/andrew_richards/archive/2011/11/29/fixing-an-icordebugunmanagedcallback-induced-hang.aspxJust posted an article on the NTDebugging blog about ICorDebugUnmanagedCallback::DebugEvent ">ICorDebugUnmanagedCallback::DebugEvent . http://blogs.msdn.com/b/ntdebugging/archive/2011/11/29/fixing-an-icordebugunmanagedcallback-induced-hang.aspxen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)