strasnge problem causing FS to exit?

a problem has recently developed with my FS9, when i press any of the buttons on my joystick the game closes without any warning dumping me back to the desktop. I have 3 controllers setup for use in FS9; a MSFF2 joystick, a Momo Force steering wheel, and an Act-Labs USB shifter and performance pedals; I have changed the assignments on the joystick, but i still get the problem when letting FS9 create a new fs9.cfg. I have even tried it with a different joystick (a Sytec Cyborg 3D Gold instead of the MSFF2) but still have the problem. I use the buttons from the other 2 controllers with no problem at all; I also used the pedals from the Momo as rudder pedals in FS and the shifter is assigned to variouse controlls just as flaps, gear, drop tanks etc. The Momo wheel axis is not assigned, niether are the clutch, brake and throttle axis' from the performance pedals.I have updated all drivers, but still have the problem, even when i press an un-assigned button it still causes the game to shut down, if i replace my joystick with my Xbox 360 controllers there is no preoblem and all axis and buttons work.Any Ideas?Cheers