rogerd - 2:12 pm on Mar 28, 2006 (gmt 0)
I think hardware issues come into play. I've owned any number of monitors, and the most common mode of failure is being too dim, i.e., even with brightness cranked up to the max and contrast adjusted properly, the display still isn't bright enough. Under these conditions, white text on black becomes more difficult to read than usual, particularly for smaller fonts. Black on white remains very readable on a dim monitor.