We have had a similar problem today, with Document Library 1.0b2 and the upgrade of Zope 2.4.2 (from 2.4.1). The errors we get when trying to view our library index_html DTML method are as follows: Traceback (innermost last): File /usr/local/Zope-2.4.1/lib/python/ZPublisher/Publish.py, line 223, in publish_module File /usr/local/Zope-2.4.1/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/Zope-2.4.1/lib/python/Zope/__init__.py, line 226, in zpublisher_exception_hook (Object: userguides) File /usr/local/Zope-2.4.1/lib/python/ZPublisher/Publish.py, line 171, in publish File /usr/local/Zope-2.4.1/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: index_html) File /usr/local/Zope-2.4.1/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: index_html) File /usr/local/Zope-2.4.1/lib/python/OFS/DTMLMethod.py, line 195, in __call__ (Object: index_html) File /usr/local/Zope-2.4.1/lib/python/DocumentTemplate/DT_String.py, line 546, in __call__ (Object: index_html) File /usr/local/Zope-2.4.1/lib/python/OFS/DTMLMethod.py, line 203, in __call__ (Object: document_browse) KeyError: (see above) We've just added the update to the Library (to b3) and it still isn't working, (unless there's something we've done wrong). Obviously this now means that our document library is broken :-(