Hi,
Yesterday I have installed the PMDG737 and on my first flight I got the same problem. In the FMS , in the equipment page, all the buttons are set for the warnings / disconnect AP / extend flaps and more , to ON. Below DEVICE in the Sound menu are no options because there are no mutiple sound devices attached to my computer.
It is indeed a great plane.
Anyone who van help us?
regards
Friet
(living in The Netherlands)