I ran the command from the topic:
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sudo apt-get install gnome-system-tools
and it made the icons on the panel for Cinnamon Settings, Cinnamon Calendar, Power Manager, etc, become double sized and change to a monochromatic appearance. Also, the buttons on the Window List no longer display the titles of their corresponding windows, just an icon and a lot of blank space.
I've restarted cinnamon and the computer. I also went into Synaptic Package Manager and marked Cinnamon for re-installation, no change.
When I tried "Restore All Settings to Default" from the Cinnamon Settings applet, it fixed the issue until after I restarted Cinnamon again (so I could move the panel from the bottom to the top).
At this point I'd appreciate any advice I can get toward getting Cinnamon back to working like normal.