Demo - unusual graphics problem

[El Kabong]

I have the same kinda problem except mine is a bit more WTF? See, I got the demo and it worked fine (Good job by the way, good game) and then bought the full game on steam, and there lies the problem, my full game is upside down while the demo was fine. I tried re-loading the game, restarting my computer etcetera, still topsy turvy. Now I'm not gonna rage about dropping money on it or anything like that, the way I see it, I still gave money to a great game developer and/or Steam (Not sure how it works, either way, good investment) but I'm just wondering how big of a problem is this?