I looked in /root/.my.cnf, and found that the password variable was apparently still set to the original value. I simply updated it with the password I had used earlier via phpMyAdmin. This allowed root to log into mySQL without prompting for a password.
Next, I ran "/scripts/cwpsrv_rebuild_user_conf", which then enabled me to access the user panels via CWP.
However, there were a couple of errors from running that rebuild script:
** (pkttyagent:27182): WARNING **: 16:36:20.768: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)
Redirecting to /bin/systemctl reload cwp-phpfpm.service
** (pkttyagent:27200): WARNING **: 16:36:20.832: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)
I cannot determine whether this is causing some other issue.
Michael