hi I'm pretty sure the container changes are not compatible because of some bad __init__ methods in inherited classes in other packages. But that's not the fault of the refactoring that is correct as far as I can see. zope.app.authentication.groupfolder.py class GroupFolder(BTreeContainer): .... def __init__(self, prefix=u''): self.prefix=prefix super(BTreeContainer,self).__init__() ^^^^^^^^^^^^^^^^^^^^ The *super(BTreeContainer,self).__init__()* will not initialize the right thing here. right? What was the reason of calling: super(BTreeContainer,self).__init__() instead of: super(GroupFolder, self).__init__() btw, did someone run the tests with all packages that depend on zope.app.container? Regards Roger Ineichen _____________________________ END OF MESSAGE