The update told me it would fix input lag caused by the overlay in some games. Thought it might fix the micro stuttering it causes in tw3, but now if i try to open the overlay it only changes the cursors look, so it switches from w3 style to windows style. So it opens something, which goes over the game, not letting you use the game, but doesn't display the overlay. You can also just close the invisible overlay again using your "toggle overlay" key again.

This only happens in witcher 3