Ok, seems like it is working flawless now. Tubepress was loading its own version of shadowbox. I went to wp-content/plugins/tubepress/ui/players/shadowbox/shadowbox.js and changed all the paths in there to the shadowbox-js (your plugin) path.
Yes im using this shortcode already and the tubepress widget works perfectly with shadowbox, but somehow tubepress prevents all other shadowbox navigations on my page from working.
The shadowbox is just opening fine, but the buttons wont work.
I think i tracked it down to the JQuery call in Tubepress:
<script type=”text/javascript”>jQuery(document).ready(function() {tubepress_init(“$tubepress_base_url”);});</script>
Any way to get around this problem?