Well, I decided to play around with the customizer and, as it turns out, I probably shouldn't have. What ultimately happened was I mucked about until I mucked it up and now all the presets and sidebar info and everything custom about the blog has been jettisoned. So, the posts are still here but nothing else is. Which, I suppose isn't a tragedy, seeing as I don't post nearly as often as I should, and I don't get a great deal of traffic, so it's likely nobody has even noticed yet.
I'll probably have to come on a little later and do some adjusting to get things back the way I would like them to be. Until then, it's going to remain pretty bare bones here. Maybe I'll compensate by posting more. You never know.
Obviously I figured out how to restore my old template. I'll still probably try and tweak it at some point. Everything else is changing, so I may as well. More on this later.