I finally found that if you open an RSS URL in a browser that does not have built-in RSS capabilities (e.g., Chrome, Firefox), you will get the error message as shown before.  Here are the browsers, and their support for RSS: Internet Explorer 11 – yes Firefox – no Chrome - no Microsoft Edge – no Safari – yes Opera – in beta status   Thank you for your help - all good now! ... View more

Thanks for your response. Results are always the same - on every page, different posts/boards, etc. Are you saying that we don't have an RSS reader?    IE doesn't give me error message but the following text at top of xml page.   <?xml version="1.0" encoding="UTF-8"?> <rss xmlns:content="http://purl.org/rss/1.0/modules/content/" version="2.0" xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/"> ... View more