WMI monitors stopped working after administrator password change.

WMI monitors stopped working after administrator password change.

Hi, we have changed our domain administrator password, also changed it's credentials in OPmanager and it passes the test, but wmi monitors are giving us " The Monitor did not respond to the test request " message.
It happens not on all servers, but only on some Terminal Servers which are running on ESX hosts.
 
To be more specific:
for a given server we have such results:
WMI CPU Utilization is not working
WMI Memory Utilization is not working
WMI Free Disk space in GB is not working
Total Sessions - Windows Terminal Server is working.
It might be coincidence, but those first 3 monitors stopped working around the same time when I added Total Session monitoring.
 
On the other machine however neither of the above monitors work, both Terminal Servers are in the same domain on the same ESX host.

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