Hello! Suddenly I am getting massive problems with Zope 2.5.1 sessions. The Zope instance was upgraded from 2.5.0 to 2.5.1 and has a lot more load now as it is in production. Nothing else has changed I guess. The problems: Frequent "duplicate key errors", and now a new one when I try to enter the session_data container (standard install with a temporary folder storing the sessions): Site Error An error was encountered while publishing this resource. KeyError Sorry, a site error occurred. Traceback (innermost last): File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/ZPublisher/Publish .py, line 151, in publish_module File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/ZPublisher/Publish .py, line 114, in publish File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/Zope/__init__.py, line 159, in zpublisher_exception_hook (Object: session_data) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/ZPublisher/Publish .py, line 98, in publish File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/ZPublisher/mapply. py, line 88, in mapply (Object: manage_container) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/ZPublisher/Publish .py, line 39, in call_object (Object: manage_container) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/App/special_dtml.p y, line 61, in __call__ (Object: manage_container) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/DocumentTemplate/D T_String.py, line 473, in __call__ (Object: manage_container) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/Products/Transienc e/Transience.py, line 403, in nudge (Object: session_data) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/Products/Transienc e/Transience.py, line 364, in _getCurrentBucket (Object: session_data) File /usr/local/zope-instances/Zopes/Zope-2.5.1-src/lib/python/Products/Transienc e/Transience.py, line 390, in _clean (Object: session_data) KeyError: 21934557A0Y4KtUyZjs One additional information that might help: The session manager is used from different URLs that point to the same Zope. Can this be the reason for problems? Is there a way of fixing that, e.g. using certain path information in the browser id manager? Any hints? Joachim