Rudder instead of Throttle on M1, when using cppm mode (FrSky)

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What steps will reproduce the problem?

Connect Frsky receiver in cppm-mode to rudder input (input 4). 
Configuration:
RXsync: cppm
Ch.order: same result on both.
Receiver inputs-screen shows the correct stick-movements. 

What is the expected output? What do you see instead?

Throttle signal on M1. Instead I get Rudder on M1 (and also on M8).

What version of the product are you using? On what operating system?
1.0
1.1.1
1.2beta3
1.2beta8

Please provide any additional information below.

This is the first time I tried OpenAero2. Previously I used the kk2-mulitrotor 
firmware on this card. 
My transmitter is a Turnigy 9x with FrSky transmitter module and openTX 
firmware. My receiver is a D8R-II Plus, flashed with the XP 27ms cppm-firmware. 
As I wrote earlier on the receiver input screen, every thing looks alright. The 
throttlestick seems connected to the throttle channel as it should. It might be 
a setting I missed somewhere, but I have tried everything obvious. Channel 
mixing for channel 1 is the default 100% throttle.

Original issue reported on code.google.com by christia...@gmail.com on 7 Jun 2013 at 1:57

[GoogleCodeExporter]

Hi, sorry I only just saw this as I don't get automatic notifications :)
Just to be clear, M1 to M8 do not map to CH1 to CH8.
M1 to M8 are free to be set up to output whatever channel you have selected.

It would only be a problem if you selected THROTTLE for the Source of M1 and it 
actually gave you the RUDDER signal.
Check the sources of the channels to see if they match what you see.

Original comment by thompson...@gmail.com on 12 Dec 2013 at 9:44