BuddyPress.org

There is something wrong with either of your theme or your shortcode syntax. We’ve been using both Visual Composer +bbPress+BuddyPress for several years and we have no issues so far.

Take note that the theme must support buddypress or bbpress, atleast from the a simple stylesheet.

Check out this theme: http://flocks.dunhakdis.com/community-forums/ . The homepage uses bbpress shortcodes formatted inside a VC block.

Cheers