Well, as the OP of this thread i'd like to thank Larian for giving us this hotfix. I now have the game again on Steam and i'm achieving some nicer framerates and can play again. Good job to all who complained along with me - It's great (and rare) for a game developer to acknowledge and act so quickly to a problem these days.
To all those who said there would be no difference between 30 and 60, and who are now enjoying the higher frame rate - :P