I'm new to the Hotstart 650. I'm having a number of issues, but first things first....
When I am seated in the cockpit, APU running, all the screens (MFD, PFD, CDU, etc) are blank. I can click on them to see that they are actually on, but they don't show up in the overall cockpit view.
My XPlane 12 install is from Steam (v12.4.2) and the recently-purchased Hotstart 650 is v1.9.