Hi, I seem to be having problems relating to AccessControl on MacOSX. I have a python product which I previously ran in Zope2.4.3/Python 2.1.3 and have upgraded it to run in Zope2.7.1/Python2.3.3. It runs fine on Linux and FreeBSD, however I get this traceback with some actions within the product on Mac OSX 10.1 Module Products.PageTemplates.Expressions, line 201, in __call__ Module Products.PageTemplates.Expressions, line 189, in _eval Module Products.PageTemplates.Expressions, line 145, in _eval __traceback_info__: shopper Module Products.PageTemplates.Expressions, line 340, in restrictedTraverse __traceback_info__: {'path': ['name'], 'TraversalRequestNameStack': []} SystemError: NULL result without error in PyObject_Call I narrowed this down to a guarded_getattr() problem in the AccessControl module. One thing I notice is that there is a C and a Python implementation of the access control stuff. If I explicitly set name='PYTHON' at the beginning of AccessControl/Implementation.py::setImplementation(), my product works fine, so I gather the problem is related to the C implementation. Has anyone experienced any similar problems on MacOSX? I notice this related issue in the zope collector, but it was rejected? http://zope.org/Collectors/Zope/232 Should I add another issue to the collector? terry