Thanks Jim, and others who offered advice.
Problem was solved by going into Google Chrome, and deleting all browsing history. Both forums are now loading properly.
Don't have a smart phone, and my Android tablet is almost as slow browsing as the old phone modems!
This is one of the hazards of not buying new computers and operating systems every few years, as the money mongers want us to do.
My computer is a Dell top of the line PC hand-me-down, but was bought well over ten years ago. It's just fine for what I do, so as long as it works I'll stick with the thing.
My wonderful son-in-law has since switched to Apple computers, so the next hand-me-down won't be so easy to learn.
Thanks again guys.
Bill