For those not aware another basic troubleshooting method when you are having issues with a game is the "Verify Cache Integrity" or some such option when you right-click on a game in your list. If it finds something missing or wrong it will re-download that part.
You can furthermore utilize this to get a new, fresh .exe too or something if you know/think you need it. Just dump your present one before running it.
“i dont care what consoles have they dont have mouse and keyboard” -crazyeyesreaper