Hey guys,
I have a GTX 560Ti with the latest beta drivers, however the problem persists even with different drivers, and a fresh install of them. Basically, whenever I try to force AA in Oblivion, it just doesn't work. What's weird is it works for other games, and settings like AF, AO and FXAA can be forced like normal in Oblivion. Just AA refuses to work, without any particular reason. I've tried changing profiles in Nvidia Inspector, different AA settings, forcing it globally, and it just refuses to apply any AA. I'm not using OBGE or ENB Series or any shader packages.

Anyone have any idea?

Most of what I have read tells me that oblivion simply does not play nicely with forced AA. I have seen case where it will sometimes work, others where it will initially work, then stop working mid-game.... and various other iterations. I don't have any clue just why that is the case though......