David, I have done some significant cleanup in the PageManager and the Customizer updates seem to be working for me at this point. I think it is safe to say that the CastorXmlPageManager version out there now is causing at least some of the problems you are encountering. Will have a patch in the morning at some point.
As I replied earlier, the security settings on "/" are preventing you from viewing the root folder back link after decending into the Public folder. It is possible to define the access permissions on a folder to be the union of all of its children's access permissions, but that seems like it might be too computationally intense to be worth it. I don't know what is best. For now, you can propagate the current constraints in "/" folder.metadata to its children and open the permissions on the "/" folder itself to allow guest access. I am currently having issues with the SiteBrowserPortlet: it apparently does not set the JAAS subject before it accesses the PageManager. Since the access is now checked in the PageManager and Folder access methods, it is getting SecurityExceptions. I have just started looking into this, but am taking a break until morning. Talk to you then, Randy