Search not working in Acrobat DC/Windows 10

I know this topic has been covered extinsively in the past, but none of the solutions worked in my situation.  I'm running Windows 10 with all updates and Acrobat Reader DC on a month-old laptop.  Acrobat worked as expected until this morning.  Now, the Search feature does not work.  CTL/F does nothing.  Clicking the Search tool icon brings up the search text box, but no input is allowed.  I have Disabled fast find, purged the cache contents, uninstalled, run the Adobe Registry tool cleaner, and reinstalled, then checked for updates  (none were found), and ran the repair utility.  This happens with multiple files, all of which allow Search in Chrome and Edge.  There has been no Windows update since Acrobat Reader last worked.  This issued is not addresssed in the Known Issues for REader DC.  Below is my installation info:

Reader DC version 2021.001.20145, File Version 21.001.20145.32109, AGM Version 4.030.00106, CoolType Version 5.014.00062, COre Version 21.256, JP2K Version 1.002.00003.48161