I finally submitted a trouble ticket to my web hosts, although I was sure they would tell me there was nothing they could do, that it was all on my end. I should have had more faith. My web hosts (Logjamming, by the way) are outstanding. I got a quick reply, a solution was presented, and now my blog seems to be working fine.
I am very, very happy and very, very relieved.
If anyone notices any more strange behavior, please let me know.