CH Propedals and CSF2

I just got a pair of CH propedals and they work great in FS 2k2 and 2k4 but won't work in CFS2. What gives?
The problem (in addition to not moving the rudder) is that they cause the throttle to go from wide open to idle about half way through the takeoff run. If I try to fly a helicopter (in the hard realism setting) the thing just flops over on its back - skids up as soon as the engine is started. In the medium setting the same throttle problems exist.
Does anybody else have this problem.
Just for the record the joystick and throttle are Saitek X52 and the pedals are the USB version.
Any help willbe appreciated.
BillA (aka Gringo60
PS if this has been previously addressed here please forgive my asking again and just point me to the answer
The problem (in addition to not moving the rudder) is that they cause the throttle to go from wide open to idle about half way through the takeoff run. If I try to fly a helicopter (in the hard realism setting) the thing just flops over on its back - skids up as soon as the engine is started. In the medium setting the same throttle problems exist.
Does anybody else have this problem.
Just for the record the joystick and throttle are Saitek X52 and the pedals are the USB version.
Any help willbe appreciated.
BillA (aka Gringo60
PS if this has been previously addressed here please forgive my asking again and just point me to the answer