There's a picture attached to this post. It should explain the problem.
I've searched for it in the web and found a few forum entries about it, but all of them just say, its because of the graphic card driver. Is there any way to solve this problem without using older graphic card drivers ?
There was another solution by just starting oblivion laucher and letting the program detect the graphic card, but that didnt worked neither, but the graphic card was shown in the options.
I'm using an Nvidia graphic card and its up to date. (Nvidia Geforce GTX 750 TI 2gb vram)
I haven't had the problem before.
Let me know if you need additional informations.