the path is just like for the version 2.4.1
wp-content/plugins/bbpress/templates/default/bbpress/loop-single-forum.php
As JarretC wrote before
Change the line 30
<?php bbp_list_forums(); ?>
to
<?php bbp_list_forums( array ( 'separator' => '<br />' ) ); ?>
Thanx JarretC
as garindan post, pls try this file to edit.
wp-content/plugins/bbpress/includes/common/template.php
Line 2249
change
// Add the breadcrumb
// $crumbs[] = '<a href="' . esc_url( $root_url ) . '">' . $r['root_text'] . '</a>';
to this
// Add the breadcrumb
// $crumbs[] = '<a href="' . esc_url( $root_url ) . '">' . $r['root_text'] . '</a>';
$crumbs[] = '<a href="/forum/">Forum</a>';