Running Openmanage essentials 2.0.0.1926

Two of my previously happy servers are now both showing the dreaded white question mark.

Both are being monitored by SNMP.

Running the SNMP troubleshooting tool on OME reports both of them as happy and able to communicate. Other servers in the same discovery group are fine.

Both servers are running openmanage 7.4.0 and are supported servers.

Any ideas where to go from here?