Something has changed in the way Zope 2.3 handles the __getitem__ protocol. This breaks SkinScript's use of OLD. The fix is to patch Agents.py so that the class _memento explicitly provides a __getitem__ method. ZPatterns may need similar fixes elsewhere. See my message to zope-dev earlier this week about the difference in using __getitem__ on Dataskins from a Specialist and in the ZODB. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net *** Agents.py.original --- Agents.py *************** *** 326,332 **** 'memento_exprs': 'Keeping:', 'handle_set_for':'Set Attrs:' } ! class _memento: pass _emptyMemento=_memento() --- 326,336 ---- 'memento_exprs': 'Keeping:', 'handle_set_for':'Set Attrs:' } ! class _memento: ! __allow_access_to_unprotected_subobjects__=1 ! def __getitem__(self, name): ! return self.__dict__[name] ! _emptyMemento=_memento()