Thanks, Jetpack is active. The latest post is titled "What is it about chickens & trade?". That's what I am seeing in Chrome on my Mac on the home page now (that's the browser I have been working from, and from which I de-activated and then re-activated Jetpack). But when I try using Safari on the Mac, or Safari or Atomic Web on my iPad, I still get last Friday's post: "Eximbank Incoming". Which post are you seeing?
I tried Twenty Eleven. It looked fine in Chrome, but hasn't shown up in Safari or either of the iPad browsers. I'm beginning to think there is a server problem rather than a Jetpack problem. My blog (and my associated company website) is hosted by Yahoo! Small Business.