[@robin-w Moderator 12 years, 4 months ago]

Try this – it should work

Function hide_author_url () {
$retval='' ;
return $retval ;
}

add_filter( 'bbp_get_topic_author_url', 'hide_author_url' );
add_filter( 'bbp_get_reply_author_url', 'hide_author_url' );