window minimized disappeared!

When minimizing an application window, it now doesn’t show up on the task-bar. Thanks for any help. Using 11.3 Gnome. (It did work properly for a few days)

This isn’t the 1st time this has happened with openSUSE. If I go to minumize an open window to the taskbar, it just disappears. Where oh where can I fix this? I think it has happened with KDE as well as Gnome. Any help would be highly appreciated…