i have IL2 Sturmovik with the latest patch. And yesterday i bought a logitech 3d force. And when i try to enable the FF on the game, it hangs up, the thing is that it doesnt throw any error or something, it just hangs, if i go to the conf file en manually enable the FF the game stops in loading...
Have you checked the joystick force feedback outside IL-2? Look at the Windows Game Controllers setup software (in the control panel with XP, I'm not sure about Vista...), there should be a way to test it there.
If that seems ok, give us some more idea about the setup you have: PC spec, Operating System, etc.
You say you have the 'latest patch', is that 4.08m, or the 4.09 beta patch?