Could it be a spyware/anti-virus conflict? See http://cygwin.com/ml/cygwin/2008-05/msg00383.html
The symptoms don't match exactly, but one running on its own but not within another sounds similar. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/