When launching the dayz server browser, the mouse cursor begins to shake, and when going in game, this continues. I've played dayz for a long time without this issue. It only began after the new update and DLC came out. You can see what I mean in the video. (video cuts half way to show mouse working normally with game closed)
The issue does not occur for any other game, or when the dayz browser or game are open but not in focus. The issue is present in the browser, in game, in the inventory in game, in settings in game, and when shift+tabbed to the steam overlay.