MS FSX-SE crashes when using multiple monitors

Hello,

I’m trying to run multiple monitors with my copy of Microsoft Flight Simulator X: Steam Edition, but whenever I drag anything (a window or the kneeboard) to another display it turns into a weird square, the game freezes, and then crashes a few seconds later. This happens in both fullscreen and windowed mode.

Any ideas on how to fix this? My system is an i7-4790K (stock) with a GTX 970.