bp_create_excerpt() in bp-core.php breaks displaying excerpt from forum

[westpointer]

In bp-forums-templatetags.php, bp_the_topic_latest_post_excerpt() calls bp_create_excerpt. However, no excerpt is displayed in the "Active Forum Topics" area.

In bp_create_excerpt(), if the line

$text = preg_replace( '|\[(.+?)\](.+?\[/\\1\])?|s', '', $text );}}} is removed, then the excerpt displays.

I haven't figured it out yet, but something in the preg_replace is removing all of the text.