I have a 2600xt (256mb of ddr4) connected via PCI. and some videos (streamming) do not go to full size, instead all i see is a full screen of two colours seperated diagonally (i still hear the audio). normal videos work fine at full screen but sights like youtube and yahoo video do not. i thought this would be a graphics drivers issue but i have the latest installed (not beta) any other ideas?