Hi,
I actually have the same problem than the OP. I use windows XP on an apple and I got Ego Draconis 2 form Steam. When I launch it the game appears upside down too.
While I was trying stuff to get it back to normal, I noticed that, if you click on the cmd button on the keyboard (the cmd button is the one also known as apple button / windows button. Anyway it's between the space bar and the alt button) it reduces the game and takes you back to the desktop. If you click on the game on the taskbar to get it back on screen, the game will come back corrected (meaning upside up and fullscreen).
You have to do it everytime you launch the game.
I hope it works for you too, enjoy the game!
Silgi
P.s: oh and shame to ATI-AMD for the lack of drivers for people like you and me... (there is a catalyst for bootcamp users downloadable on their site dating from june 2010 but it doesn't correct this issue).
P.p.s: I'm unable to post the same answer ont the steam forum (I just made an account for this right now and the activation link in the email hasn't done its job up to now). Could you (once you confirmed it works, of course) tell the people there the same thing, if I haven't been able to do it meanwhile?
Last edited by Silgidorn; 03/01/11 01:16 PM.