I have recently purchased Arma 3 via Steam and downloaded the game into my Macbook Pro. When I first opened the game everything worked perfectly. I even managed to do the bootcamp and play around in the Virtual Reality room for a couple of hours. But once I closed the game and returned later, everything glitched out. Textures were not loading, the main menu didn't show up completely, many options lacked even the text and the only way to solve this was to change the resolution of the game, hope it didn't crash and restart it multiple times until it loaded properly. Once it loaded correctly, it continued to work fine until you close the game.