I just replaced and amp 2.5 with a pixhawk and now seem to have a strange issue where upon restating the pixhawk the roll pid is zero! I discovered this by setting the mode stabilize and noticed the controller does not make any adjustments for roll. I looked in the 'tuning' tab in APM Planner and sure enough it's at zero. I changed it to 1.000 all is well until the pix reboots then it's again lost!! I connected to another computer and this time used MP... set it back to 1... save.. but again upon restart the roll pid is zero!
running the latest arduplane 3.0.3
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Update.... Seems fine now. Not sure what was the problem. Only thing I know I did for sure was change another pid after setting the roll pid to 1. Seems like sometimes it didn't remember the very last thing I sent. Bad mavlink maybe? Baud rate was at 57600 though and seemed good. Just a gremlin I guess. I'll take a gremlin on the workbench any day over a gremlin in the air :]