APM 2.6 Cannot Calibrate Radio

I’m having a similar problem i think to http://ardupilot.com/forum/viewtopic.php?f=82&t=12316
PX4 turned on, Tx turned on
Rx has solid orange light to suggest connection.

APM 2.0 connection via usb and/or 3dr

Pre-arm check. Rc not calibrated.
All the channels are showing as active and respond to Tx adjustments.
I go to calibrate
Then i get the message ‘radio control is not active or turned on.’

What do I need to do?

thanks in advance

Please post the log from ~/apmplanner2/log.txt There should be more info why the calibration is failing

Also try 2.0.18-rc2 as the build firmware.diydrones.com/Tools/APMPlanner/beta/

What TX are you using? How many channels?

That’s done it, it seems as though there is a lot more functionality within APM also now, previously maps weren’t displaying but they are also there. Thanks!