Anyone seen a state change is pending for agent error on a Hyper V physical host?

Foglight reports "Cannot establish connection to servername: State change is pending for agent fb8be857-fbcf-4747-973d-295a8570e581/HyperVAgent/5.7.7/HyperVAgent/HV1-servername.ncri.ie. Connection to host servername has been cancelled."

I have:

- Rebooted the Foglight server
- Rebooted the Hyper V servers
- Created new credentials for the agents for two misbehaving Hyper V physical hosts (I have 3 others in a different cluster which are working fine)
- Created new agents for the two misbehaving Hyper V physical hosts

Any ideas?

Thanks
Alan