Apparently, the user registration form could not be accessed the last week due to missing file access rights. This has been fixed now. Thanks a lot to Dave for reporting this! Please let me know in case anyone finds another page that is inaccessible/returns an error 403. Thanks. 🙂

A related issue: when viewing the front page as a guest, the “More…” link, which should go to the registration form, instead goes to /register.php, which doesn’t exist.

Thanks, Matej! Fixed that.