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the syntax coloring preview in tools > options > Fonts & Colors is always initially shown with a white background, even when a dark theme (such as "city lights") is selected. To get to see the correct background color, one must change the "language" category at least once. similarly, when one changes the theme, the corresponding change of background color is not shown. Changing the language category forces the new color to be shown. To my knowledge, this is a platform independent bug since it happens on windows 7 64 and linux (ubuntu 9.04) 64 bits.
This seems to be working fine in my 6.9dev build.