So, you've now got two appliances deployed monitoring the same infrastructure?
Have you restarted the original appliance?
If the resource have a green collecting indicator, it's not in maintenance mode in vC Ops.
When you say "nothing at all for any datacentre with a cluster or larger configuration present.", which vC Ops deployment are you referring to? Is this a common problem across both vC Ops deployments? When you say "nothing at all", are you saying that no resources are getting created for them, or are they getting created and marked blue/unknown?
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