[Zope] authentication problem

[Bob Shelton]

i have a python product which inhertis from ObjectManager.
i programmatically create instances of this product within
itself as they are requested by the user.
the problem is that i am getting an 'unauthorized' exception
when i try to access index_html of the programmatically
created objects.

the really odd thing is that it only happens SOMETIMES.

i get this:
Site Error
An error was encountered while publishing this resource. 

Unauthorized

Sorry, a site error occurred.

Traceback (innermost last):
  File /usr/local/src/Zope-2.3.3-src/lib/python/ZPublisher/Publish.py, line 223, in publish_module