@Pauliehedron@e569668 Well, it's a little better. The thread with the broken thumbnail image no longer produced a 500 Server error, so I was able to delete it. The /m/FloatingIsFun microblog still only returns 500 Server errors, and since that's the interface we use to write new microblog posts, I can't write them anymore.
@Pauliehedron Holy crap, @melroy fixed it! I wondered why my profile started working again. I had no idea Jerry was about to give up on kbin, but we're now running Melroy's fork of kbin! Hail mbin!