I know Bill Bonney has posted of some serial code problems on the Mac in recent versions - perhaps this is part of them.
I have been unable to update parameters on my Pixhawk from Mac OS X 10.9.4 in APM 2.0.10, 2.0.11 and 2.0.12. I’m loading parameters from a file and making some edits. The file was created on 6/22/2014, and probably written by APM 2.0.10. However, I have the same problem if I do a fresh boot, and change one parameter by hand.
The symptom is that it starts to write the params, but then never finishes. And upon a “refresh” I find that most (if not all) of the parameters were never actually written.
I’ve deleted config and preference files, re-installed FTDI drivers, tried different bad rates (USB) and also wireless connections. Re-flashing the released firmware also resulted in no joy.
What is the recommended way to debug these problems? I’m stuck with the config that’s on my Pixhawk until then…