Today I swapped in a Lemon Rx 8-channel, with PPM output in place of a Spektrum DSMX satellite RX. I tested and calibrated before sticking down the hardware with foam tape. The new receiver bound and connected on the first try. All of the other hardware seemed happy as well. RC calibration worked perfectly. When testing afterward, I can't get past a "RC not calibrated" error. I've recalibrated several times. I put the old Rx back in, recalibrated, same result. I have also tested without any Rx connected and get the same result.
The funny thing is, the ESCs chirp as though I hadn't performed ESC calibration. I've repeated that too. They don't stop chirping when I hold the safety switch.
Hardware is Pixhawk. Software is APM 3.3x.
This copter flew this morning. I'm stumped. Any help would be appreciated.