It's running and working okay, but every so often, when running it, I get: 2001-04-27T09:15:23 PANIC(300) ZODB A storage error occurred in the last phase o f a two-phase commit. This shouldn't happen. The application may be in a hosed state, so transactions will not be allowed to commit until the site/storage is r eset by a restart. Traceback (innermost last): File E:\Zope\23CF7D~1.2B2\lib\python\ZODB\Transaction.py, line 335, in commit File E:\Zope\23CF7D~1.2B2\lib\python\ZODB\Connection.py, line 657, in tpc_fini sh File E:\Zope\23CF7D~1.2B2\lib\python\ZODB\BaseStorage.py, line 219, in tpc_fin ish (Object: SessionStorage) error: release unlocked lock The relevant bit of code is: path = self.getSessionDataContainerPath() timeout_mins = self.getInternalDCTimeoutMins() onstart = self.getOnStartPath() onend = self.getOnEndPath() container = self.aq_parent ob = SessionDataManager(id, path, title, timeout_mins, onstart, onend) container.manage_delObjects(ids=[id]) container._setObject(id, ob) Any ideas? cheers, Chris