We are running Zope 2.5.1 and ZEO 1. When someone does an Undo it doesn't seem to update all of the ZEO clients consistently. Some ZEO clients reflect the undo, others sometimes show an older version of the database and sometimes we get POSKeyErrors. Any idea what causes this? It's an old version of ZEO, is this a known bug? The traceback is below. Thanks, -Brian File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/ZPublisher/Publish.py, line 114, in publish File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/Zope/__init__.py, line 159, in zpublisher_exception_hook (Object: cristina.d.farmus.1) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/ZPublisher/Publish.py, line 98, in publish File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/ZPublisher/mapply.py, line 88, in mapply (Object: manage_main) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/ZPublisher/Publish.py, line 39, in call_object (Object: manage_main) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/Shared/DC/Scripts/Bindings.py, line 252, in __call__ (Object: manage_main) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/Shared/DC/Scripts/Bindings.py, line 283, in _bindAndExec (Object: manage_main) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/App/special_dtml.py, line 172, in _exec (Object: manage_main) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/DocumentTemplate/DT_In.py, line 637, in renderwob (Object: objectItems) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/DocumentTemplate/DT_In.py, line 763, in sort_sequence (Object: objectItems) File /data/www/Zope.11b/src/Zope-2.5.1-src/lib/python/ZODB/Connection.py, line 447, in setstate File /data/www/Zope.11b/Zope/lib/python/ZEO/ClientStorage.py, line 294, in load (Object: ('192.168.1.52', 11900)) File /data/www/Zope.11b/Zope/lib/python/ZEO/zrpc.py, line 168, in __call__ POSKeyError: 00000000001aeea2