Thanks jcl,
I already tried all the possible values (1, 4, 9)without success. I also tried to set the aa on my card settings and this works fine.
It screws up as soon as I use the d3d_antialias instruction no matter what values I use.
I will test out this thing on a diffrent machine with an ATI card.
Maybe this is a nvidia problem

cheers and thanks

zwecklos