Update: This appears to be a front-end issue. I was just able to enable exclusive SSL by updating the wp_options table manually and changing the value of wordpress-https_exclusive_https to “1” (for true). However, now the single page I’ve set to load securely is loading with no CSS whatsoever and is still only half-secured. I checked to make sure that the wordpress-https_remove_unsecure flag is set to false (“0”).
Any ideas?