Hi, Every so often, if I go to a URL like: http://x.com/btreefolder/fileobject I get this weird error: Error Type: NotFound Error Value: The object at http://x.com/btreefolder has an empty or missing docstring. Objects must have a docstring to be published. Traceback (innermost last): File /usr/local/zope/2.5.1_base/lib/python/ZPublisher/Publish.py, line 89, in publish File /usr/local/zope/2.5.1_base/lib/python/ZPublisher/BaseRequest.py, line 320, in traverse File /usr/local/zope/2.5.1_base/lib/python/ZPublisher/HTTPResponse.py, line 502, in debugError ...where btreefolder is a version 0.2 BtreeFolder and fileobject is a normal Zope 2.5.1 File object. The amazingly frustrating thing is that if I refresh the URL, things work exactly as I expect :-( Any ideas?! cheers, Chris