The drivers for the Quadro RTX4000 were version 430.86, which seemed outdated. I've since installed version 461.40 (latest for this card according to Nvidia) performing a clean install to remove any settings and profiles used in the past.
This has not changed anything. Also, all OpenGL programs don't work. Tested with Google Earth and Blender. The Nvidia Control Panel also seems to be missing all the options I used to have!
Any ideas as to what needs to be done to fix this?
Side note: From my desktop PC (CPU: Intel i7 2800K, RAM: 32GB, GPU: Nvidia GeForce 560Ti), which has a dedicated Nvidia card, I was able to connect to the workstation and everything worked normally.