Forever loading after do_action slideshow_deploy AJAX call.

I am attempting to include a slideshow in the response of an AJAX request. I use a call to

ob_start();
do_action('slideshow_deploy','[id]');
$result['content'] = ob_get_clean();

However, the content returned simply shows the ‘loading icon’ html and never updates. I assume there is some jQuery waiting on an event or something. Any pointers?

Thanks

https://www.ads-software.com/plugins/slideshow-jquery-image-gallery/