NWN run fine with MesaFx6.1.0.4 or older, MESA_FX_IGNORE_TEXUS2=y(i have white backrounds if i don't disable texus2) and a V5 5500.
Now, with mesafx6.1.0.8 i have the same problem than Bloodworm.
i didn't tried mesafx 6.1.0.5/6/7.

Bye.

ps. sorry for my poor english