David Paul wrote on Dec 31^st, 2014 at 4:04pm:

FWIW, in order to get the plane working right, I have to set up the flight, hit "Fly Now", then exit out to the free flight menu, then go back in.  Reloading the plane doesn't help, only works if I go all the way back out to the menu then back into "Fly Now!".  It has been that way on my system (FSX Acceleration on Win7-64) since day one.

Sorry, but I can't quite get what your doing, or why your doing it. :-/

I always start FSX, using my default flight (the default C172 cold and dark but with the Avionics Master Switch ON), I change the airport and time of the day (if I need to), then I press Fly Now.

Once FSX is ready with the C172, then I select the aircraft I want to fly. I do this primarily because if I want to start a different flight with a different aircraft, when I select End Flight, my FSX Start screen is ready for another flight but the C172 is the aircraft showing in the window. It's like a nice fresh restart of FSX.

Try doing that to see what happens. The 777 loads fine into FSX, and works fine too.