[Burt Adsit]

Looks like something is improperly stripping the lt and gt chars from your forum text. Do you have the bbpress plugin buddypress-enable.php activated in bbpress? It comes with bp and is distributed in the /mu-plugins/bp-forums/bbpress-plugins.

Has something disabled the standard bp filter bp_forums_filter_decode() that lives in bp-forums-filters.php?