Finally got Xplane installed and working semi with Mission Planner. I do get tx input, param and fine tuning writing capabilities, and start/ stop of simulation from the MP to Xplane, however, I am not getting feedback from Xplane to Mission Planner. For example, my horizon indicator isn't moving according to the aircrafts' attitude on Xplane. Nor is the aircraft/ GPS (from MP) pegged at my airport location (to Xplane). 

I'm using Arduplane 2.74b with Xplane 10. 

Any suggestions?