MOst games I've downloaded on steam have worked perfectly, but I have two games I've never been able to play because they won't launch Kerbal Space Program and Doorways. Both games seem to download fine, but when I try an play them nothing happens. The games icon shows up in the dock, but there is no load screen, I eventually have to force quit the game. Im running a brand new Mac Pro, so I know my hardware is fine and my OS is up to date. I've tried verifying caches, but that doesn't work. Anyone know why these games won't run?