Safari keeps reloading pages after update to 15.6.1 and Catalina security update

I'm having a problem that started after the latest Safari and macOS Catalina Security Update 2022-005 today (15.6-->15.6.1 and 10.15.7, respectively). Safari browser windows try to reload on an endless loop (see pic). This is what has not worked so far:

1) Restarting Safari and the MacBook Pro

2) Removing Safari extensions

3) Tried using a private window in Safari

4) Removed Symantec Endpoint

5) followed the Safari help article: If Safari on Mac doesn't open a webpage or isn’t working as expected - Apple Support

6) Reinstalled Catalina

I'm running a 16" MBP 2019 and other browsers work fine. There is a similar problem identified in this posting: Safari keeps reloading for no reason - Apple Community

Full discolsure: I also replied to the above posting but before I tried to reinstall Catalina.

Anybody else having this problem? Thank you!