Comment on Clickbank WordPress Themes by Glenn Shimabukuro.
Thank you very much for that tip!
After a fresh load of posts on the site in question, the side bar problem appeared to “move” from the 1st page to the 2nd page. I checked the next page (#3), and the side bars were intact and displayed correctly.
I was able to isolate the problem post on page #2, deleted it, and the side bar issue was corrected.
Thanks again for your advice on this issue!
P.S. Glad to hear that the Talian theme v. MPP theme has been resolved!