broken gamma support

i have p3 500 w/8meg i740 video. have been running q3 since oct. 99. now when the opengl starts to kick in everything loads up fine then haveway thru the text reads opengl extensions not found. warning: broken gamma support, generated gamma.dat. this is really aggravating since the i740 supports opengl and i was playing the game when everybody else had to download opengl drivers for there video cards.
somebody please help