This happened to me mid-game when I was trying to zoom in on something, so I changed the video settings to very high, and the graphics went absolutely TERRIBLE, I would take a screenshot or record but when I screenshot it takes a picture of the top left corner of the screen of whats behind DayZ when its running, so theres two problems that I cant figure out. Its like when I play DayZ the mouse is 4x bigger than normal and its zoomed in really weird and the graphics aren't even near being bad, they are HORRIBLE to the point were you can only see the general shape of things.
