GTN screen is black

[SenorDroolcup]

I installed the GTN Trainer and the GTNXi Flight Sim programs. I start up MSFS and get the green notification that GTN is connected to the sim, but when I open either the GTN750Xi or 650Xi, the screen is black while flying in MSFS. It's like the unit won't power on. I ran the Trainer independently and it works normally, just can't get the GTN750 to start while in game. I checked the dll file and it's installed properly, not quarantined by Windows defender.

Running latest MSFS in Windows 10.