I have an EVGA Nvidia 960 and when running DirectX 11 and closing the game, it never closes properly, stays in a black screen and I have to go to the task manager to force close the game. I get the "The program stopped working" notice.
Drivers are all updated, and I have no problems while I play, but I've been only able to close the game properly once. I'm on Windows 7 btw.

I wonder if it's really an Nvidia graphic cards thing, or something with the client itself.