Aja output not functioning in new plugin

Does the current implementation only support 24P, or are all HD SDI & UHD (4K) formats supported?

I am experiencing the same issue using the Corvid 88 card, UE4.20.1 not showing any SDI output. I have not tested input yet, and I do not have a 4K monitor, so I am limited to all HD SDI formats.

Also, I updated to the latest firmware & drivers from AJA (images attached).

AJA Control Panel Video Ouput works showing all test patterns on SDI 3 output. Tested various formats to confirm card is working ok, and using card with other broadcast solutions. This is in a HP Z820, Windows 10, nVidia Quadro K6000.

Thanks in advance for your help.