Anti Aliasing with 250 gts in 1946

[rcguru1]

Hi, I've gotten back into IL-2 and for some reason my anti aliasing has stopped working. I figured it was possibly due to driver issues. However, I have tried reinstalling the 301.42 drivers as well as using older drivers that I know the AA worked with and still nothing. I have also tried using nvidia inspector to force AA on. I have reinstalled IL-2 and tried it both patched and un-patched.

I have noticed however, that if I switch from OpenGL to DirectX the anti aliasing works fine. I have no clue why this is happening, I'm pulling my hair out! Any ideas?

Oh and I'm running xp-32 bit and an nvidia 250 gts.