I can't get the autopilot to engage for anything other than attitude hold. Anything that requires me to press the NWS/Autopilot button on the stick doesn't work. No altitude hold, no heading hold, etc. Following the instructions, step by step, I get the the "AP Ref" light to illuminate just fine, every time, but pressing the NWS/Autopilot button has zero effect.
Any help is appreciated.