Hi, I didn't see a posted solution to this problem in the lists, so I thought I'd give my 2 cents. The documentation, http://www.zope.org/Members/TheJester/exUserFolder/UnenlightenedZopistasGuid... is perhaps a little unclear on one issue, namely the placement of the exUserFolder object. The documentation states that "5.3.1 Place the user folder one level *above* the folder you want to protect, that is in the unprotected area. Everything should work fine." To many people, the root folder (/) may contain the folders you want to protect. If the "acl_users" folder (default Zope folder when you install Zope) exists, the installation of an exUserFolder will fail (with the "cryptic" MessageDialog error message). In short, to fix this, create your main site to be in a sub folder of "root" (e.g. 'main') without a user folder, then add your exUserFolder here. (Perhaps this is common knowledge, but as I said, I didn't see this answered in the list archive.) Regards, Tor Houghton