We have four servers… each in different country and different domain. Each has their own Admin team, so I don’t believe the source of the problem is specific to a server (serverdoc) - each server has their own nab that doesn’t replicate. Each server has a da50 or daconf that lists two additional ‘directory’ databases which do replicate everywhere. None have any recent changes in the ACL and nothing obvious in their design.
fixed: The directory was corrupt. Database restored from previous version and all is working nicely.