Now I see what happened. Somehow the "Notification Area" got removed from the panel. I added it back; problem solved. IMHO, it shouldn't be possible to remove it; you can't live without the thing.
Now I see what happened. Somehow the "Notification Area" got removed from the panel. I added it back; problem solved. IMHO, it shouldn't be possible to remove it; you can't live without the thing.