This seems to be an issue for multiple games running on exclusive fullscreen mode. Happens with Child of Light, Rocksmith, The Witcher, Resident Evil Revelations, World of Warships and a few others from what I could see. They all share the same circumstances, and the only way to avoid this issue is to set the game to run on borderless fullscreen mode.
When stuck in this black screen, the only way out is to press ctrl+alt+del, and blindly go to the "change user" option ("down" and "enter" after pressing the combo). After logging back into Windows, the issue is gone. Another way of avoiding this issue is to alt+tab from the game, exit it from the taskbar or forcefully killing the process.
I would like to say that this is a problem related only to Windows 10 Anniversary Update. This issue never happened before on previous Windows 10 builds and the reproduction rate of this issue is 100%. If you have an affected machine, this is going to happen every time you exit an affected game. This seems to happen only to a handful of games, so keep that in mind.