I did scan through to see if this new issue for me has happened before, but my "searches" came up null.
Latest version of SS NG and P3d v3.35.
After loading and completing a flight using a selective scenery config setup, example (USA only) I shut down and come back later to begin another flight. Still using my "USA only" scenery config setup as before, the only change would be the departure airport. P3D splash screen appears then a very very quick "Generating Scenery File Index" flashes and the splash screen disappears. P3D is running according to task manger but nothing else appears. If I restart SS NG and choose to load my full scenery config file P3D loads fine. The same issue will happen if i start another flight with the "full scenery config" after that flight. This is a new issue as I have never had this problem before.