Je hebt waarschijnlijk de gebruiker Anonymous verwijderd.. Kijk even of die weg is, als die weg in voer dan de volgende querie in je phpmyadmin uit om de boel weer te laten werken:
INSERT INTO phpbb_users
( user_id, user_active, username, user_password, user_session_time, user_session_page, user_lastvisit, user_regdate, user_level, user_posts, user_timezone, user_style, user_lang, user_dateformat, user_new_privmsg, user_unread_privmsg, user_last_privmsg, user_emailtime, user_viewemail, user_attachsig, user_allowhtml, user_allowbbcode, user_allowsmile, user_allowavatar, user_allow_pm, user_allow_viewonline, user_notify, user_notify_pm, user_popup_pm, user_rank, user_avatar, user_avatar_type, user_email, user_icq, user_website, user_from, user_sig, user_sig_bbcode_uid, user_aim, user_yim, user_msnm, user_occ, user_interests, user_actkey, user_newpasswd )
VALUES (-1, 0, 'Anonymous', '', 0, 0, 0, 1060668358, 0, 0, '0.00', NULL , '', '', 0, 0, 0, NULL , 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, NULL , '', 0, '', '', '', '', '', NULL , '', '', '', '', '', '', '');
