I've recently installed version 4.2 of the 757 for FSX, and I've encountered a peculiar problem - I cannot seem to tune any of the COM radios on the radio stack. I cursor over the tuning knob, as well as the frequency windows, and get the usual + and -, but nothing I do will change the frequency. I've tried numerous times, with the aircraft in a fully powered state.

Has anyone else encountered this issue? Any ideas on what may be happening?

Thanks for any tips.

- Bob