In the Options display - e.g. Video Options, there are multiple "tabs" - in the case of "Video", for example, there are "Basic", "Rendering" and "Quality". When you click on a tab, it "pulses", but once you move the focus to other controls on the page, the "pulse" stops, and you have no feedback as to which page you are on.
*Very* minor issue, but the currently-selected "tab" should probably have a different colour to provide feedback as to which one is selected.