I have a theory.. you're the only person I know of with a different language on their PC. Is it possible for you try the game with your system being configured for English and see if there's any different effect there? I believe the game engine I'm using automatically translates to the system language, and it's possible there could be some sort of conflict there. If this is the case, I will be able to fix it and you can return your system to your native language.