I'd love to see this getting some attention. I find this a serious issue, at least on my end.

Yeah it still seems like this issue persists. It seems like it's only affecting a few people, however for those few people it's a huge problem as we all know. So hopefully this issue will get some recognition.

@FriendlyFire
It't obviously the game that's the problem since as you said, in other games the mouse will move to the other monitor and invisibly hover over menus and other clickable "objects", but when you click the mouse it's still in the game. This doesn't happen in DayZ, well it moves to the other monitor, but when you click it actually minimizes the game and clicks whatever you were hovering over instead of activating what ability you've bound the left-click button to.