Hi,
By moving the VR appliance VM, do you mean removing it from the vCenter Server inventory and adding it back (or removing its host from the inventory and adding it back) ?
If yes - that destroys the OVF environment for the VR appliance in vCenter Server database and might later affect the VR appliance extension login to vCenter Server.
Similar issue might occur if the VM is powered on through client connected directly to the host, not to vCenter Server. In that case the OVF environment would appear to be missing, but power off of the appliance and power on through client connected to vCenter Server will bring it back.
Can you check if you right click on the VR appliance VM, select "Edit Settings -> vApp Options -> OVF settings" and try to view the OVF environment, that there is some XML file? If yes - the OVF environment seems to be there and you are experiencing another issue.
Regards,
Martin