hidden minimized windows

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http://forums.fedoraforum.org – using the an old monitor ...I am encountering heretofore strange behaviour NOT the fault of the monitor when I minimize a window, it does not show up in a stack above the icon in the lower panel as in ALL previous KDE desktops When I hit some unknown key or click on some unknown icon, I see all the minimized windows lurking out of sight. Any idea of how to get the minimized windows properly stacked on top the icon in the panel (HowTos)