If you are running Bing Desktop, turn it off. For some reason if it thinks you've moved the mouse enough to the top of screen (i.e. when trying to look up), the Bing Desktop app tries to take over your computer. This causes the Hitman Absolution screen to go black for several seconds. If you press any key before Bing kicks in, Hitman Absolution will eventuall draw the screen again. If you don't your desktop will paint and Bing search bar will show up. Disable Bing Desktop and you'll not see the black desktop while in Hitman Absolution again.