I had that problem but I figured this out. If you have only P3D and don't have FSX that problem occur. Before read runways just change in Ai Monitor first button for p3d. After that everything will work like a charm. Happy Flyings.
For all who has dark cockpit, change HDR setting in P3D options. Make more than 1 for your taste. Just change and stop when you like it. I had that problem too but not anymore
And that what I got before