Hi again, I removed the original appliances (vApp) by disassociating them from vCentre and removing the asset from the Solutions tab. This was completed successfully before deploying a new vCOPs vApp, and this was again registered with vCentre. So there were never two sets of vCOPs running at the same time.

When I'm referring to a lack of data within vCOPs for a certain datacentre (i.e. nothing at all) what I meant was that when I try to expand the DC name using the drill down option on the left pane I am able to expand it as far as displaying individual cluster names, but no health information is being received from any objects within it. All of the folders within the datacentre are detected, but displayed only as grey squares on the health map.

This was multi-datacentre hierarchy was working fine like this for at least 18 months, and the missing information is consistent with what I couldn't view on the original appliance and the one which I've just deployed in place of it. The following screen capture shows the hierarchy expanded to its full extent, but I can definitely confirm that the permissions are identical for each datacentre.

The only other slightly new thing that we've done recently is set up VM Storage Profiles for use with Storage DRS.