Coders, I wrote this patch for threading.py which corrects an unhandled exception problem I ran up against. --- threading27.py Mon Apr 05 20:23:34 2010+++ threadingmod27.py Tue Mar 29 10:16:59 2011@@ -439,6 +439,7 @@ self.__stopped = False self.__block = Condition(Lock()) self.__initialized = True+ self.isSelfInLimbo = True # sys.stderr is not stored in the class like # sys.exc_info since it can be changed between instances self.__stderr = _sys.stderr@@ -484,7 +485,9 @@ finally: # Avoid a refcycle if the thread is running a function with # an argument that has a member that points to the thread.- del self.__target, self.__args, self.__kwargs+ if not self.isSelfInLimbo:+ self.isSelfInLimbo = True+ del self.__target, self.__args, self.__kwargs def __bootstrap(self): # Wrapper around the real bootstrap code that ignores@@ -515,7 +518,10 @@ self.__started.set() with _active_limbo_lock: _active[self.__ident] = self- del _limbo[self]+ if self in _limbo:+ del _limbo[self]+ else:+ self.isSelfInLimbo = False if __debug__: self._note("%s.__bootstrap(): thread started", self) I also posted this patch to the python "Asking For Help Wiki" at wiki.python.org. You can find it by searching for title "unhandled exception threading". This may not be the very best solution for the problem, but I believe some correction is in order. Sincrely, Jeff Jacobs