Turns out my hosting company upgraded the Perl version on the server, and didn’t include all the modules that are required to run Movable Type, so that’s why things were basically wacky the last few days. I just finished installing the Perl modules into the MT installation itself, so I won’t have to rely on the host having them globally available, and hopefully, everything is back to working. For today anyway.
If that was all gibberish to you, just know that I think everything’s working again and feel free to ignore this until I post something else. 🙂