I see that a lot of people are having this exact problem as of late, including me, and no one has given an answer that has helped remedy the problem. Most of these requests for help are just unanswered. I am ready to find a new blog software, as it is frustrating to be paying for something and not to be able to get any support on an obvious flaw that has just cropped up. I have done nothing different than I have been doing in the last year. For my only menu (sidebar column) to disappear and the bottom of my page makes my extensive blog pretty much useless, except for the first page. But to have no navigation off the first page makes the rest of the blog useless...even if it does exist out there.
Maybe you have figured out the problem??? Please contact me if you have! email@example.com