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Safari 14 does not seem to work with American Express or several other important sites. It says the pages needs to reload then give a blank page with an error.

Screen Shot 2020-09-22 at 9.41.00 AM.png
 
Safari 14 does not seem to work with American Express or several other important sites. It says the pages needs to reload then give a blank page with an error.

I just tried logging into my Amex account. No issue. Try creating a new clean user account. Login to the new user and see if you have the same issue using Safari. If you don't, from your current user account try this:
  1. Safari→Preferences→Advanced, enable Show Develop menu in menubar. Select Safari→Develop→Empty Caches.
  2. Exit Safari.
  3. In Finder, browse to your user account Library→Containers, move all the com.apple.Safari* folders to the Trash and empty the Trash.
 
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