I have the usual equipment, FS-TH9X transmitter and D4R-II receiver. I upgraded to Copter 3.3-rc11, and then the transmitter stopped working correctly. That could just be coincidental to the problem at hand.

Everything else works fine, the 3dr usb radio works when hooked up to my Mac, and APM is getting telemetry from the Pixhawk.

The green light on the receiver changes from red to green when I turn on the transmitter, but that's all I get. There's no telemetry about altitude, battery, or satellites coming to the transmitter. When I try to Calibrate the radio, APM says "Radio control is not active or turned on".

The lights on the FrSky DJT are steady red and flickering green.

I've tried binding several times, in different sequences. When binding, the transmitter beeps about once per second, the green light is steady, and the red light flashes, maybe 8 times per second. On the receiver, the red and green lights are steady when ready for binding, and then the red light flashes at about 8 times per second when the transmitter is turned on in binding mode.

Newsflash!

Tried it again and now I'm getting battery information, satellites, and distance. But still when I look at the calibration screen in APM, I'm getting nothing, and if I hit the Calibrate button I still get "Radio control is not active or turned on".

What the heck is going on? I wonder if I should try 3.3 again.