I'm using the latest (1.1.18) version of Mission Planner with X-plane. I reflashed my APM1280 with the latest version (can't remember what it picked!) and all seems to be configured correctly, but I'm missing something!
I can fly the aircraft manually - i.e. the radio inputs are delivering a corresponding output into X-plane, and Mission Planner is reporting the correct IMU data from X-plane under Plane IMU but when I switch to an auto mode - stabilise, FBW-A etc, nothing happens. It took me a while to realise that APM is using the data from the Oilpan, which seeing as it's sitting on my desk, is close to precisely zero as inputs! Once I picked it up and began wiggling it, I could make the aircraft in X-plane move with it! :)
Why is it doing this? I haven't downloaded the latest source code, which I normally did, configuring HIL mode manually, so I've no idea how APM knows it should be in HI-mode - i.e: using HIL data for its control.
It's frustrating since I've had this thing working well on earlier versions!