It works fine there and on my website that i still run 4.0, with the new changes it logs accounts after 15 minutes & generate random timestamp for last visit, so you may notice some accounts not log out at the same time or have them with the same last visit, if you like them to log in faster change
$time = time() - ( 15 * 60 );
Change 15 to a lower number, i will add a setting on the next update.