I love the contrast themes and am very familar with how to enable them change them ect. One problem I have is with buttons. For instance in the settings menu of the browser I am using Opera, the buttons to chose various options completely disappear in a theme when applied. With no theme they are visible.
The same problem exists with the blogger.com site. Changing colors in the text for instance. The buttons are invisible when a theme is applied but show fine with no theme applied. Hard to pick a color. Mouse over shows name of color but no buttons exist. or colors in the buttons.