Hi again.I can't change my Nav 1, 2 Com, 1, 2 and the ADF. i can change my transponder though. Sounds strange to me. Any clues what it is and how i should solve it?

Patrik,This problem is caused by the position of the Avionics Switch in FS9.Once you are in PMDG737 , there is no way to turn it on or off.The cure is either:a) start off in FS9 with a default Cessna with the Avioics Switch ON and then change to Aircraft to your desired PMDG737 or:( assign a keystoke or a button on your joystick in OPTIONS to turn the Avionics Switch on and off.Cure a) is the most straight forward.David.