The game froze and black screened when changing the hardware AA setting lower. when using a resolution greater than 1080p on a 1080p monitor using super resolution(1440p i think). The only way to close the game was alt f4 as all windows elements were transparent when alt-tabbing. After the game had closed the only thing I could do is shut down my pc using alt f4 as all the windows UI elements were only showing outline. I thought it messed up the graphics driver in some way which I have updated to the latest version but it still happens. Relaunching the game after a pc restart causes the game window to be stretched off screen even with DSR enabled and I needed to edit the DayZ.cfg manually to reset resolution and after doing so DSR worked correctly again.