[_ck_]

fel64, the string is internal to bbpress, not the template loop.

Look at forum.php template to remind yourself

<?php while ( bb_forum() ) : ?>

<tr<?php bb_forum_class(); ?>>

$forum is being treated as a global and not reset back.

I could remember and reset $forum I guess before and after the while-loop $temp=$forum; loop-here; $forum=$temp; but that’s an ugly hack. It’s got to be fixed in the core and that’s beyond my knowledge of bbpress.