This problem was entirely caused by me. For some reason I moved the following lines to above the “That’s all, stop editing!” line in the wp-config.php. Moving them back to the bottom of the file where they belong fixed the problem.
/** Absolute path to the WordPress directory. */
if ( !defined(‘ABSPATH’) )
define(‘ABSPATH’, dirname(__FILE__) . ‘/’);
/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);