Problem Resolved: I quit Calibre, then deleted the library/preferences/calibre folder (actually I moved it to the desktop just in case I needed it later). Next, I opened Calibre again and went through its very basic setup steps. I had to switch the library from the default to my library on the external SSD, quit Calibre again but then after restarting Calibre one last time everything worked just as it had in the past. I suspect the Apple Migration Assistant failed in some manner. In any case I'm good again. Thanks to all who offered advice, including an off-line colleague who suggested this solution.
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