Inspire 1 Firmware v1.9.1.30 is concerning, after update I did GPS calibration (As I always do after updates) I was in my normal flying environment, I'm running the latest version of DJI GO, I got a notification box saying something about the ultrasonic systems Error and that I needed to land immediately, Note I was still on the ground, I dismissed the notification. the status bar said safe to fly GPS, the APP says firmware is latest, I then restarted the aircraft to see if I would get the notification again (I did not) I proceed to do my test with caution , I had 12 SATS upon takeoff, I noticed right of the bat that the self adaptive landing gear did not raise I noticed the inspire didn't seem as stable in the wind and it had the attendance to ascend and descend by its self (A small upwards/downwards drift) my absolute altitude was grater then Pressure altitude.
the Inspire one was about 17 feet AGL and the DJI go app said between 1-3 feet started with 0.0. I was able to figure out that when the aircraft in in stable hover, altitude seems to zero out making the aircraft think that its at ground level thus the reason the self adapting landing gear didn't work. I would not want to try a return to home because I can't imagine the craft turning off in 65 feet above the home point because it thinks its at ground level once it finds a stable hover. I landed with -feet took off more then once, and was able to repeat, I restarted the APP, same thing.
Hope this helps you help others and me

Clancey Aggen
7/18/2016
Time to downgrade