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I tried both Revnart's and Gedstar's suggestions and neither worked. I had never paid much attention to the Essentials, Design, etc. workspaces until Revnart pointed them out, but resetting Essentials didn't help. I even tried creating a new custom workspace, but that didn't work either.  So I finally surrendered... I de-installed and re-installed Photoshop, so for the moment everything is back to normal. I don't know if I accidentally hit a button that I shouldn't have, or if it's something more concerning. There was a post here several weeks ago where somebody suggested that older versions of Photoshop (I have CS5) might be unstable on Windows 10, which I have recently upgraded to.  Everything was fine for a couple of months, so we'll see if this issue happens again.