D'oh. You are, of course, correct. I should have scrolled up in the console prior to the screenshot.
Well, it can't hurt to try another fresh install, but this time I'm going to completely remove vanilla first, manually delete anything left over in the directory, and reinstall. And this time I get to reinstall DF 4.1.0 instead of 4.0.4! I always appreciate you taking the time to reply, even when someone like myself makes an obvious mistake. You really do have an immense amount of patience.