On Windows XP, if you're running ZQuest in fullscreen mode, then press the windows key (something I end up doing quite often by accident because I have to press 'Fn' which is right next to it to change CSets ¬_¬😉 obviously it minimizes the game and opens the start bar.
If you then click on ZQuest on the start bar to open the programme back up to fullscreen again, the menu bar at the top goes completely black. If you move the mouse over it, it goes back to normal, then if you move it off again it stays black.
If you then uncheck the fullscreen option on the Misc. dropdown menu, then check it again, it goes back to normal.
EDIT: Oh, I say 679 but I think I've noticed this back in 2.10 even.