Bf 109: No throttle response while using flaps/trim

[Matze81]

Hey guys!

FMB missions:

When I hold down the key to lower or raise the flaps in the 109, my throttle does not respond anymore. Same goes for trim inputs. Only after I released the flaps key it starts working again. It's a real pain.
I've been having this problem with my previous Vista PC and I'm having it now with a Win7 PC as well. I even use a different Joystick/Throttle with the newer PC but I've always had this problem.

Multiplayer:

Funny thing is, when I play online Multiplayer everything works fine. The throttle works normally when I'm extending or raising the flaps. I don't know why.

Does anybody know this problem and has a solution for the Offline/Singleplayer part?

Thanks!