[Zope] GenericUserFolder has locked me out.

Maybe I wasn't reading the docs closely enough, but once I dropped that GenericUserFolder into my folder, that's it. the end. I can't get in, even as the superuser. I can't FTP in. Removing the GUF product just stops IT from stopping me getting in, but it seems to have dug its claws into some other hooks, so I STILL can't get in. Ever tried removing an object from an export in XML? I'm finding it a little tricky to follow. Even so, when i try to import it again, Zope barfs up some complaint about a KeyError on "id". So... can anyone suggest how I might recover from this disaster? Many thanks for comments, curtis