@rmackay9: Thank you very much for taking the time to look at my case.
I'll try something else to demonstrate my issue.
Powered my S500 Pixracer AC3.4-rc5 quadcopter, connected MP, gone to the compass calibration screen, selected PixHawk/PX4 and performed compass calibration (compass1 is on uBlox Neo m8n GPS+Combo, compass2 is Pixracer internal):
Went to Flight modes and clicked on Save (just to be sure that everything is saved).
Disconnected, removed power.
Reconnect power, connected to MP, gone to compass calibration screen and nothing is saved (notice that "Externally mounted" is no longer checked as it should be):
I am attaching the parameter file after connecting the second time. I do not know what I am doing wrong.
The same setup worked on rc2 and rc4, I'll try to revert back to it (I have to find the .hex that I've kept).
Again, thank you very much for your help.
S500_AC34rc5.param (10.0 KB)