My flight simulator won't restart after shutdown.

How to stop flight simulator from hanging after closing.

Flight simulator may hang if you don't shut down a certain way, it will then stop you from relaunching the simulator. A few ways of causing this is pressing the X in windowed mode or using ALT+F4. 

In order to to stop the flight simulator from hanging, you have to close the simulator using the quit to desktop option.

If you did not shut down the simulator in the correct way, you have to fully close the simulator in task manager.