I have just upgraded to mission planner 1.3.6 build 1.1.5306.14681 and I can not get the compass calibration to work. I am building a new copter and this is a show stopper for me since you can't arm without compass calibration (quite sensibly! )
I just tried on my old copter which used to calibrate fine and its not possible there too ... can you help?
Please see attached screenshot for error details.
PC is running Windows 8.1