It was all Windows' fault. Windows FTP seems to think that it shouldn’t notify me if I’m overwriting a .htaccess file. So I overwrote one, and killed Typo (The blogging engine that I use for From Harvard Street). It’s fixed now.
Also fixed - all the permalinks to Harvard Street posts now redirect to the corresponding pages at Complaint Hub. So if you’ve linked to a post, the link still works, it just takes you to Complaint Hub instead. I’m quite proud of myself.