Actually I've solved it completely (I think).
By removing this line from register.php
and changing $user_name = trim(get_post_var('user_name')...
By removing this line from register.php
Code: [Select]
array('input', 'username', $icon_array['username'] . $lang_register_php['username'], 25),and changing $user_name = trim(get_post_var('user_name')...