Dieter Maurer said:

What did you do to achieve your aim?

I just tried with a folder:

I removed the "acquired" settings for "Access contents information" and "View" and granted these permissions to "Manager" (only).

I then visited the folder as "Manager" -- without any problems.

Thank you for the response. I did almost exactly the same thing as you did--except substitute "Authenticated" for "Manager". This should have affected only the Anonymous role, but instead rendered the entire tree from that point down inaccessible to all users, including Managers, Owners, and the Admin account. Also, a recent experiment yielded interesting, and troubling, results: rather than removing privileges from the Anonymous role, I tried adding some. That produced the same result--after the change, that folder and all objects below it were inaccessible no matter what username and password I tried. At this point I'm thinking there's something corrupted somewhere, and I'm considering doing an export of everything that's absolutely necessary for the site, then importing that into a fresh install of Zope. Of course, I don't *know* that the export won't include whatever's causing the problem, thus carrying over to the new install, but it's all I've come up with at this point. Does anyone have a better idea?