Sometimes (under Ubuntu MATE 16.04) I apparently press some evil shortcut, and all windows get minimized to the sidebar (Panel).
Strangely, I can not un-minimize (restore, maximize) them. Also opening a new Terminal (ctrl–T), that Terminal starts minimized. So cannot even restart the windows manager…
Clicking on them in the sidebar or plank, briefly shows the animation lines of opening/closing, perhaps showing the window for a millisecond, but that's about it…
All I can do in such situation is to reboot…
Any advice, what's wrong?
Switching to console and back (ctrl-F6/F7) does not help.
I am not talking "Hide all normal windows and set focus to the desktop" from the keyboard shortcuts. I have a shortcut for that, I am aware of it, and minimizing as well restoring with that does work. Must be something different…
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