Philipp Dunkel writes:

I have a Zope Product that makes use of different nested classes. When I create an instance of this product I always get an "unauthorized" error when clicking the instance in the management interface (=accessing <instance>/manage) even if I am logged in as a manager or superuser. Looks like a Zope bug.

However, you must at least include the traceback in order for us to say more. Probably, you must even package your Zope Product and give it away, such that someone of us can analyse your problem in detail. Dieter