Reply To: Should bbPress work 'out of the box' with my theme?

If there is anybody interested, i had the same problem with Origin. To solve, i edited the file breadcrumb-trail.php (bad idea, but i’m not using a child theme but a completely modified version of Origin). So, on line 450, we had before:

/* Get the queried forum ID and its parent forum ID. */
$forum_id = get_queried_object_id();
$forum_parent_id = bbp_get_forum_parent( $forum_id );

And now, working fine (exactly as John said here):

/* Get the queried forum ID and its parent forum ID.  */
$forum_id = get_queried_object_id();
$forum_parent_id = bbp_get_forum_parent_id( $forum_id );

Hope it helps.