I found a skin I really like, but I dislike the "light gray on slightly lighter gray" scheme the designer chose for "Selected Items."

OK, so I go into Display->Appearance->Advanced->Other Advanced Controls, and change the "Selected Items" setting to something that works for me.  Everything's fine ... for about an hour ... then the colors go back to the default loaded by the skin - and I can't figure out what triggers the change-back.

How do I make my color settings *stick*? 

SKS