I today purchased the GTN 750 for use with X-Plane 11 and so far it's working great. The only thing I didn't find out was how to fly an LPV approach. When I load and activate the approach there is no vertical guidance, even if I set the autopilot to APP mode (and GPS source). The trainer announces "LPV" so I guess it's in the right mode. Everything else, like ILS approaches, holdings, go arounds etc. all work fine. Did I miss a setting or step?
P.S.: tried with Carenado C90 and TBM850