Dashboard dials not working

Hi there.

We had a few servers successfully reporting fully to OpManager including the dashboard status dials, but after a backup and restore of the opmanager MSP server database, now one of the servers which is a DC doesn't show information in the dials.

SNMP is configured with correct traps etc and hasn't changed since it was working, and you can go into any SNMP or WMI monitor on the server and it does show all current reporting values and even the Active Directory information is all being successfully obtained.

All servers except this one are working with those dashboard dials.

Any ideas?