"Access not permitted" - Map Status Probe

Q. We have several overview maps that have more detailed maps included as Map Status probes. Even after creating a user and defining explicit read-only access to the map the status on the overview map is "Map Status: Access not permitted". But if I log in as that user I can indeed access the map. The overview map and the submaps are all on the same InterMapper server.

A. Since the submap map is on the same server as the overview map, in this case, credentials are not required; simply delete them from the probe settings and the user will be able to access the submap from the overview map.

On this subject, for no apparent reason, we've started getting the "Access not permitted for user**" when we do a map status.  Most of our maps are affected and are also showing as Orange.  If you double click an affected map, it opens up fine.

Can anyone offer any advice as to what to do here?