I did the update as usual via WordPress updates. After updating this plugin i tried viewing who has been online. Got some kind of popup notification that something didn't exist, i should have screen shot the error but didn't think much of it at the time.
Trying to load my site all the CSS was missing. Trying to log in i got an error that wp-login.php was not found. Tried deleting this plugin didn't help. I ended up restoring the previous plugin from a backup and restored my database from a dump done early last night and got the site back up.
Possibly the .htaccess in the WordPress root directory could have been bumbled. I noticed a deny from statement = but no associated ip. I use my own .htaccess in the sites root so maybe they were conflicting with each other.