Another bug I've found, in Story Mode, is if you're watching a cinematic and your screen saver kicks in, when you get back in-game, the cinematic is frozen. You can exit it, menus work, but restarting simply loads up a frozen cinematic. You can go play other modes of the game no issues though.
The only solution I've found is to exit back to desktop and to reboot the game.
Speaking of this, outside of disabling it or delaying the timer, does anyone know how to have Windows stop a screensaver from turning on when your watching cutscenes or have the game paused? This is something I've never been able to figure out.