only in ArmA 3. i have over 70 games on steam and i never had this issue before. so far i can say that esc, w, a, s, d and rest of usefull keys don't functioning, somehow and thankfully ctrl+alt+del(also alt+tab) is working so i can exit the game. sorry for late answer.

Yes, i just checked it and i have same problem on lastest version. Alt+tab is working though. When i do alt+tab and then re-open game, it gets fixed.