I have a Radeon 7870, two screens.
At first the game started with very low resolution and noticed that I could not click with the mouse on menu items, using tab and arrow keys I updated to 1920x1080. At that point the menu did not appear and the Arma3 symbol was partially visible on the bottom left of the screen.
Tried to disable the second screen, now I just have the background (which seems to be correctly place with any situation.
Cannot start the game as I cannot see the menu {F16955} {F16956} {F16957}