Hello all,
Thankyou for your helpful suggestions.
The solution was simple but not easy to track down.
During the transfer of the cloned hard drive to the new server, all hardware-related items are removed/uninstalled from the device manager in order to get the operating system ready to discover and accept the hardware on the new server. When this was done, the "Terminal Server Device Redirector" was deleted in the Device Manager/System Devices by mistake. I re-cloned the drive and did not remove "Terminal Server Device Redirector" the second time.
Everything worked like a charm.