I've had this working before, but can't get a signal now. I have mode set to raw output at UHD 30p. On SDI, Shogun Inferno says no signal on SDI. I can switch to HDMI, and then it can record it at 1080p, but for some reason at 60 fps instead of 30.
Figured it out. I was using an SDI cable that wasn't fast enough. Replaced with a 12G cable and all is good, along with a Shogun firmware update for good measure.