@gmarco24 and @talymo32, you are definitely in the right direction here, but you are missing a small part. Placing rw_the_post_rating($postID) in the PHP is correct, but the JS must be notified that the rating element must be rendered. Unfortunately, currently there’s no way to render specific rating, though you can re-render the whole ratings. Try to add this into your lightbox:
<?php rw_the_post_rating($postID); ?>
<script type="text/javascript">
RW_Async_Init();
</script>
Let me know if that worked.
Anyhow, @gmarco24 please tell me exactly what WP version and bp-media are you using and I’ll add it to our TODOs list.