All, I was able to get DeadlockDebugger working. I think my initial threadframe installation was corrupt, but re-installing both threadframe and DeadlockDebugger seemed to fix any issues there. With the following output, do I have enough information to go to someone with a bug report? At this point it seems Zope isn't the problem, but I want to know if there is any other information I can glean before reporting a bug in LDAPUserFolders or python-ldap. So: I have a spinning Zope and the DeadlockDebugger output. The last few lines of each thread look like: File "/var/www/zope/Products/LDAPUserFolder/SharedResource.py", line 110, in __call__ self._lock.acquire() File "/usr/local/lib/python2.4/threading.py", line 100, in acquire rc = self.__block.acquire(blocking) One thread is stuck here (possible race condition?): File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 169, in simple_bind return self._ldap_call(self._l.simple_bind,who,cred,serverctrls,clientctrls) File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 91, in _ldap_call self._ldap_object_lock.acquire() And finally, one thread is stuck here: File "/var/www/zope/Products/LDAPUserFolder/LDAPDelegate.py", line 292, in _connect connection.simple_bind_s(user_dn, user_pwd) File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 760, in simple_bind_s return SimpleLDAPObject.simple_bind_s(self,*args,**kwargs) File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 176, in simple_bind_s self.result(msgid,all=1,timeout=self.timeout) File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 399, in result res_type,res_data,res_msgid = self.result2(msgid,all,timeout) File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 405, in result2 return self._ldap_call(self._l.result2,msgid,all,timeout) File "/usr/local/lib/python2.4/site-packages/ldap/ldapobject.py", line 94, in _ldap_call result = func(*args,**kwargs) What do these thread backtraces show? What additional information can I gather? Best wishes, Matthew -- "The challenge of a moral life is to do nothing that requires forgiveness." - Roger Ebert in his review of _The Woodsman_