It appears that the most recent updates to Norton Security Suite have erased the Minimize and Close icons from the header bar of the Live Update program. The functions are still there, and can be used, but you must search for them by moving your mouse in the general area of the buttons, then wait for the tooltip to appear to verify which icon you are on. This is a low-level bug, but it is irritating if you wish to minimize the Live Update window, especially if you miss the Minimize button and hit Close by accident.