OK, never mind. I guess. I finally found a few other people posting about the same problem and the "solution" was to simply revert includes/class_core.php back to the version from the 3.8.5 tarball. That works fine. So I guess I'm back in a "good" state now.
Although it still seems a little strange to me because the posts that *were* mangled before depending on how they were posted up are now displaying OK. So I have to think the actual text in the database is different depending on how the post was made and that the display-side of things is what's trying to fix (or not) the difference.
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