Once the registration form is submitted the page directs to /register.php but is just blank. No details are submitted to the database so nobody can register.
Have you found a solution to it for the later versions?
Notice [PHP]: A session had already been started - ignoring session_start() in file include/common.php line 177
Notice [PHP]: A session had already been started - ignoring session_start() in file include/common.php line 177