If I launch the game in fullscreen, the screen goes black and the computer remains frozen: alt+tab, ctr+alt+supr, alt+F4 or ESC are not working. The only way is using the reset button.
However, when steam lets me choose the windowed mode, there is no crash and the game works as expected. Steam only gives me the option to choose between windowed or fullscreen mode when I launch Arma3 with steam closed. If I launch it with steam already opened, it just go straight forward to the fullscreen mode and ir crash. {F17013} {F17014}