I flashed APM with ArduPlane 2.28 From APM Planner 1.1.34 , and executed "setup" and "reset" in terminal.
At first I noticed that inverting roll axis was impossible after the initial calibration, I inverted roll axis by modifying "-1" on CH1 to "1" - The GUI does not reflect this on the calibration screen.
That's not the worst part;
Manual mode gives (naturally) smooth aileron operation
Stabilized mode, - compensates correctly for APM roll. - smooth and nice.
However: in stabilised mode, I can move the stick to one way, and roll nicely, but at the end of the other way, the aileron goes absolutely bananas, jumping around randomly, while I hold the stick steady.
Is this firmware stable ? - what do you fly ?