It's been a longtime since I have played Technic, and when I tried to open Voltz it was upside-down. A few others have done that too. The screen has flipped, but the button locations have stayed the same. If I over where the single-player button is, it will glow on the reversed side. I have a MacbookPro and it says it is launcher build 431, some other mods have just not started. Thank you for the help.