Hello, when using "splots"(?) style with 2x2 AA the graphics change completely into some sort of buggy miscoloured green form.
My system configuration:
Windows 7 32-bit
Intel Dual Core E5200 @ 2.5 GHZ, 2 GB DDR2 RAM
NVidia GeForce 9400 GT driver version 285.62

By the way I'm not sure whether the splots style is working at all on my specs, I was messing around with the video options and thought it would be a good idea to report.
Splots:

Splots + AA

I think it works as intended in the first picture. Note it looks like painted with drops of paint.

I have the same issue - as soon as I enable 2x AA with Splots, I get ugly blue artifacts. Just like in your second picture.

My specs:
Debian Linux (Wheezy 64 bit)
8800 GTS
Core 2 Duo E6750
2 GB RAM

I think that is a unintended side effect of splot mode as it is still experimental.