Its not you, its me.... ok that sounded weird.
BUT in the meantime we moved to another server and had a problem with the regcode block. SO the generator has now moved to your personal settings.
Any registered user can go to "MY ACCOUNT" and see his personal registraiton code on top of the page.
Link is on top of the main menu, here is the direct link:
http://www.palaceplanet.net/user.php
(for registered/logged in users only)