There appears to be a problem with NVidia's new drivers...

[Sajt]

qrack has ansiotropic filtering, test with gl_anisotropic 8 see if u get the error.
Its realtime so no neeed to reset map. though gl_aniostropic 0 doesnt really turn it off only enables bifiltering

also set drivers to application controlled.

for other games maybe force it.. etc etc.. or just call tech ( u might need to speak another language...)

You combined gl_texturemode with anisotropic stuff?