If your screen is turning grey might be your video card. I know when my vsync got reset my fps went over 200 and a lot of things were getting greyed out in the game. My card was overheating. Is your computer overheating? If your stuck and can't do anything hit the windows key, click on the the bottom tool bar, open task manager and end task to turn the game off. You should always save your game frequently especially for when problems like this happen. We have all been there, forgot to save, game messes up and loose everything you worked on.