Why do the "overlay" and "openglnbl"-renderers produce somehow unaccurate, hazy image - so it makes them unpleasant to watch? This forces me to use either the "surface" or "opengl" methods, but bilinear filtering isn't suitable for all the games and I would like the small speed increase that "overlay" apparently should bring...

My gfx card is GF3 Ti200 and I am using the Forceware v56.72 drivers.
DirectX is 9.0b also.