Figuring out why Antialiasing isn't working

[Cesar]

I want to figure out why Antialiasing isn't working well in D2X-XL. I don't have any problem adjusting Antialiasing (either by game options or Display Properties) in other 3D games such as Half-Life, Doom III, Unreal/Tournament, Serious Sam II, etc. Is Antialiasing working properly for anyone in D2X-XL?

On my side, none of the Antialiasing modes work in D2X-XL except the 8xS mode; unfortunately, in 8xS mode only vertical lines in the game get rendered as 2xAA instead of 8xAA (as shown in the screenshot below).

http://img51.imageshack.us/my.php?image ... hot9os.png

I'm on Windows XP SP2 with nVidia Geforce 6600GT 128MB (MSI NX6600GT). I have DirectX 9.0c installed, and I have tried nVidia drivers version 78.01 and 81.98 and d2x-xl version 1.5.125 and 1.5.131.

I'm not the only one with this problem, as there was another user that had the same problem in the old Bug Report thread.