As noted elsewhere I was having issues yesterday evening with loss of KBM, unable to get in the game at all. This morning I was able to start the game but the display shrunk on me and the mouse aim was "off". On investigation my resolution had changed itself from 3840 x 2160 (4K) to the rather odd 640 x 350. Changed back and seems okay but will keep an eye on it.
I seem to recall this happening to one or two other players after a recent update. Guess you have to keep an eye on the settings page.
