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JudasIscariot: Have you updated your drivers?
tolteko: Yes, they're up to date... At the moment I'm playing with the 1.0 until I'll fix this issue.
Back up your save file(s), uninstall the game and choose "No" when asked whether you want to keep your saves, re-install the latest version of the game and try a new game. If this happens again, please write to Support so we can see where the problem lies. Thanks :)