Let's see if I remember lol

Okay, right now I am flying a New York to London route.  I started out with the cleared for takeoff situation, then moved it to the active runway at KJFK.  (I have things to do today!)  I turned on my doppler on the overhead and switched it to "land" from "sea."  (Probably doesn't make any difference.)  I put the selector on the controls on the center console to "auto" and loaded a flight plan via FSX.  I know it worked because the "miles to go" equals the distance to the first waypoint.  I manually set the course in "selected course" window, but that doesn't seem to matter, either, because while the miles to go updates at a new waypoint, the selected course window contents never change.

I would try reloading the flight plan if that doesn't work.  Hope this helps.  Right now I'm trucking along beautifully and right on the flight plan.