Sometimes I see only a black screen (it shows the mouse cursor - movable, not sure it is there always) when I log in and the world is loaded. Most of the time it works fine, tha darkenss does appear only occasionally.
It appears to work fine, just instead of the world I see darkness.
It is different from the other black screens. I see character selection fine, never saw color distortion.
The machine got some GF 6600 or 6800, probably old drivers as I am unable to update drivers there.