My system (win 10, dell xps 8900, invidia 970) has two monitors, one 1600x900 (large) and another 1360x768 (small). When i originally installed Xplane 10 i was using the small monitor as the 'primary'. Full screen worked perfectly, Switched the primary to the large monitor and now Xplane will only render at the smaller resolution on the large monitor, and only the small monitor resolution options are available in the resolution drop down box.However when i disable the small monitor then Xplane runs in full screen on the large monitor, no problem. Suggestions? Next step is to reinstall Xplane from scratch using the large monitor as primary.