CH USB Yoke & CH USB Fighter Stick Throttle Problem.

Let me try asking this question another way.When I have both of these devices plugged in the throttle on the Stick will not work with the Bell Helo. It does work with other aircraft. If I unplug the Yoke the throttle works fine on the Bell Helo.Does anyone no of a compatibility problem like this.Thanks in advance to all who reply.Regards!BillP4, 512 memory and XP Home OS