Hi all, i think i have found a bug in using TransparentFolders. Let it explain step by step. First the Structure: Folder_A Folder_B_Transparent You have Folder( Folder_A ) and create a new TransparentFolder Folder_B_Transparent in Folder_A. Then go to the SecurityManagement of the Folder_B_Transparent and Disable the acquire permission setting of any permission(s), maybe Use MailHost Service or so, and save the changes. Then go Back to the Folder_A and try to open the SecurityTab of Folder_A. I got the following error only if any acquire permission setting is disabled in Folder_B_Transparent: <!-- Traceback (innermost last): File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 223, in publish_module File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 187, in publish File /usr/share/zope/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: Traversable) File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 171, in publish File /usr/lib/python1.5/site-packages/ZPublisher/mapply.py, line 160, in mapply (Object: manage_access) File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 112, in call_object (Object: manage_access) File /usr/share/zope/lib/python/AccessControl/Role.py, line 257, in manage_access (Object: Traversable) File /usr/share/zope/lib/python/Shared/DC/Scripts/Bindings.py, line 324, in __call__ (Object: _normal_manage_access) File /usr/share/zope/lib/python/Shared/DC/Scripts/Bindings.py, line 354, in _bindAndExec (Object: _normal_manage_access) File /usr/share/zope/lib/python/App/special_dtml.py, line 236, in _exec (Object: _normal_manage_access) File /usr/lib/python1.5/site-packages/DocumentTemplate/DT_With.py, line 146, in render (Object: _.namespace(valid_roles=valid_roles())) File /usr/lib/python1.5/site-packages/DocumentTemplate/DT_In.py, line 650, in renderwob (Object: permission_settings) File /usr/share/zope/lib/python/AccessControl/Role.py, line 182, in permission_settings (Object: Traversable) File /usr/share/zope/lib/python/AccessControl/Role.py, line 177, in <lambda> AttributeError: (see above) --> thanks, as