> In any case, after this message appeared, the workspace switcher was > gone from the panel. But more importantly, the area that shows which > programs are open, enabling minimization and maximization of programs > and switching between programs, is blank. There is no way to see a > list of the programs that are open, and a program that is minimized > becomes permanently inaccessible.
First I would try to just add them back. Right click on the panel, click "Add to panel...", and try to re-add "Workspace Switcher" and "Window List". If you can't add them back, or if they crash again, run $ killall mate-panel Your panel will disappear. Then, run $ mate-panel The panel will reappear. See if any error messages appear in the terminal, and if so copy/paste them here. (Whenever a graphical program fails to do something and does not provide a helpful error message, you can often get more information by running the program from a terminal.) Then, try again to re-add the workspace switcher and window list. If any errors are printed to the terminal when you attempt to add them, copy/paste those here as well.
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