Apologies: we have had significant issues with the site today. The entire site was inaccessible for almost two hours, and currently only the home page is working; every individual post is displaying an error message. We are working behind the scenes to get things up and running again. Please be patient.
7:20 PM EST. The issue seems to be resolved. Note to techies: if you change .htaccess in WordPress, be sure to place the file in the domain, not the root (i.e. in the /yourdomain.com folder, not the / folder).