you have one bug. in functions_phpbb_topic_tagging.php find: function get_tag_cloud($min_size, $max_size, $col1, $col2, $limit){ global $phpEx, $user, $config; replace with: function get_tag_cloud($min_size, $max_size, $col1, $col2, $limit){ global $phpEx, $user, $config, $phpbb_root_path; find: .ap...