Winterbite
Then it sounds like the code wasn't fully replaced or old code is being cached or something. I would move all code files out of the site directory to a backup folder, re-download latest code from our website, upload ZIP to server, unpack the ZIP, copy latest code to your site folder, copy back your old include/ost-config.php file from the backup folder to the new include/ folder in the site folder, restart the webserver and PHP-FPM, and retest.
Cheers.