bbPress.org

ok, you got me interested enough to look it up.

bbPress now uses its own version of make_clickable, so the two filters are :

add_filter( 'bbp_get_reply_content', 'bbp_make_clickable', 4    );
add_filter( 'bbp_get_topic_content', 'bbp_make_clickable', 4    );

so you need

remove_filter( 'bbp_get_reply_content', 'bbp_make_clickable', 4);
remove_filter( 'bbp_get_topic_content', 'bbp_make_clickable', 4);