Adding a SiteRoot object to some folder upward from a ZDConfera topic ("Confera Topic" object) will break the topic. It seems that when adding a message, instead of inserting a valid message object, ZDConfera ends up adding a corrupt object. At one point ZDConfera, when I tried adding a follow-up, duplicated the parent message instead of adding the reply, resulting in a circular reference that only a database restore would fix. This is Zope 2.1.4, SiteAccess 1.0.1, ZDiscussions 0.2.0, on Slackware Linux 2.2. Here's the traceback. Error type: AttributeError Error value: 'None' object has no attribute 'date_created' Traceback (innermost last): File /usr/src/Zope-2.1.4-src/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /usr/src/Zope-2.1.4-src/lib/python/ZPublisher/Publish.py, line 179, in publish File /usr/src/Zope-2.1.4-src/lib/python/Zope/__init__.py, line 202, in zpublisher_exception_hook (Object: ElementWithAttributes) File /usr/src/Zope-2.1.4-src/lib/python/ZPublisher/Publish.py, line 165, in publish File /usr/src/Zope-2.1.4-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: test) File /usr/src/Zope-2.1.4-src/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: test) File /usr/src/Zope-2.1.4-src/lib/python/OFS/DTMLMethod.py, line 145, in __call__ (Object: test) File /usr/src/Zope-2.1.4-src/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: test) File /usr/src/Zope-2.1.4-src/lib/python/TreeDisplay/TreeTag.py, line 154, in render (Object: a tree tag) File /usr/src/Zope-2.1.4-src/lib/python/TreeDisplay/TreeTag.py, line 245, in tpRender (Object: ElementWithAttributes) File /usr/src/Zope-2.1.4-src/lib/python/TreeDisplay/TreeTag.py, line 491, in tpRenderTABLE (Object: ElementWithAttributes) (Info: (['Diskusjon', []], {'childless_decoration': '', 'id': 'tpId', 'branches': 'messageValues', 'url': 'tpURL', 'sort': 'date_created'}, [['Diskusjon', []]], [['Diskusjon', []]])) File /usr/src/Zope-2.1.4-src/lib/python/TreeDisplay/TreeTag.py, line 331, in tpRenderTABLE (Object: 953744195) AttributeError: 'None' object has no attribute 'date_created' -- Alexander Staubo http://alex.mop.no/ The difference between theory and practice is that, in theory, there is no difference between theory and practice.