tipztv you shouldn't have to do any checking if the user is logged in when posting a score, Clay.io should take care of that. The reason it does turn to one is closing that box logs the user in as anonymous. The most recent version of the plugin is 0.4.4 (check the README file, the documentation page isn't updated as often - takes a decent bit of time to do so).
chef - responded on the Clay.io forum