[kh99]

I suspect that it's a character encoding issue, but I don't know much about handling that kind of thing. I did find this page: https://dev.mysql.com/doc/refman/5.0...t-literal.html, so maybe try

PHP Code:

$db->query_read("SELECT userid, avatarid, avatarrevision 
                            FROM " . TABLE_PREFIX . "user WHERE username = _latin1'LeO™'"); 


or maybe _utf8 in place of _latin1.