I have been flying the default XPlane 11 Cessna 172 to fly ILS approaches into the ORBX Southampton scenery. RWY 20 is a Cat 1 runway so the ILS/VOR1 should show both the runway axis and glide slope. It doesn't show the glide slope at all - the needle does not move no matter how high or low I am on approach. The runway axis needle says to fly left when it should say to fly right. I have tried to fly at Newcastle; neither needle works, nor do they work at Seattle (RWY 34C). In all cases I have used the NAV1 frequency quoted by XP.
Also, my Saitek radio panel only works intermittently - sometimes on, sometimes off.
But, when I have tried Liverpool and Gatwick, the needles behave as they should. The ADF/NDB gauge works properly at all airports.
How can I make the ILS gauge work properly?
Thank you.