Hello Paul,
I agree with tazzo that the problem is related to the utilization of integrated Intel UHD graphic card for the processing.
You can try to install the latest Intel driver for your CPU and UHD Graphics 630 and check, if it helps. Also after the driver update you can check, if the processing works, when "use CPU" option is disabled in the GPU Preferences tab.
But usually it is much better both in terms of processing performance and stability to use discrete GPU for the processing.