Apparently the problem was related to the basic structure of the IPS software and srcset would not help with my problem. The best solution was to create a free Cloudflare account to use as DNS something or other according to a developer who graciously stepped in to help me pro Bono. He set it up for me. I changed my name servers to the new Cloudflare settings and voila! Problem solved. Members now have unfettered access again and faster page load speeds. E’erbody’s happy! All’s well that ends well. Am I right?
I hope this info helps the next newb who gets stuck like I was. That’s why I posted it.
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Merlinz's post in How to use srcset on IPS 4.4 was marked as the answer