Hey guys, I don´t know if it´s a bug...but in the german version the antialiasing levels are called "Stufe1", "Stufe2", "Stufe3" and than it goes on with "Level4", "Level5"... That´s not a real problem, but if you turn on Stufe 1, 2 or 3 ingame, it disappears after hitting "apply" and switchs back to "keine" ("none"). The others, called "Level..." are kept after apply.
I have the exact same problem from day one (meaning Build 64) on my Setup screen and already posted about this somewhere with a screenshot. Antialias are mixed French and English in the list like below: 0: Aucune 1: Niveau 1 2: Niveau 2 3: Niveau 3 4: Level 4 5: level 5 etc. And on side note similar to OP if I select something under Level 4 it just fall down to none inside the game (GTX670 and previous WHQL NVidia driver, didn't update yet).