[Zope] ZWiki ignores proxy roles

I've been fighting ZWiki Pages for a couple days now and I finally realized that it's probably *not* my UserFolder that's the problem. I have a Python Script that wants to append to a ZWiki Page for a user (who does not have permission to do so). The script has sufficient proxy roles, but I always get an "Unauthorized: You are not authorized to edit this ZWiki Page." The script can make other objects (like folders) that the user can not, but when it comes to a Wiki, it's powerless. I didn't find this in the archives anywhere, but what I'm really hoping for is a quick workaround. (I need to demo this tomorrow.) Any ideas? Thank you! --kyler