Sounds like the video card is not up to snuff.
thanks for the input larry, im using an AMD FirePro V5900 2GB DDR5 card, i checked the drivers and it indicates that it has the latest drivers installed. the first few days i was using ai cs6, this bug/error wasnt there. it happened around 4 days ago, but when using ps or id, the error doesnt occur. i'll try to check if there are incompatibilty issues between the card and ai