New to forums and somewhat of a novice in flight sim - would appreciate your forbearance.I have been running PMDG 747 successfully with FS2Crew in my old pc but I am now experiencing problems on my new machine.When I press button 3 during flight it will respond to the FO but also disconnect the autopilot. When I look up the configuration in the generic settings in FSX button 3 is not assigned.Im using a Saitek52 joystick in Vista - if that helps.

When you press the button on your joystick, you could be 'wiggling' the joystick a bit at the same time, resulting in the autopilot disconnect.That said, try increasing the null zone on your joystick.This is why I actually personally recommend using the keyboard to control the FS2Crew commands for this very reason.Cheers,Bryan