Formidable PayPal – published post problem

I have set up a Formidable Pro form which allows people to register and add a post. It works perfectly.

I have also added Formidable PayPal to require payment before the post is published. This is working too.

The post is initially created as a draft, then after payment, the post is published. The problem is when clicking the published post’s thumbnail/title to see the full post, it takes you to the home page instead of to the full post.

If the newly registered user updates their post via the same Formidable form, the post updates and the link then works fine. It’s also fine if I update that post through the WP dashboard. The link also works fine if I tell the form to automatically publish the post instead of creating it as a draft. So the problem is only occuring after a post is changed to ‘published’ by the Formidable PayPal add on.

It is as though the PayPal add on is forgetting to include the post link (post_ID ??) when changing the post from draft to published.

Am I missing something? I’m using latest version of the plugin and the add on. Also latest version of WP and theme.

In my functions.php I had initially tried the code from http://formidablepro.com/knowledgebase/formidable-paypal/

but that didn’t successfully change the post from draft to published.

So the code I’ve added is from:

http://formidablepro.com/help-desk/paypal-callback-link/

add_action('frm_payment_paypal_ipn', 'publish_paid_post');
function publish_paid_post($args){
if(!$args['pay_vars']['completed'])
   return; //don't publish if the payment was not completed

if(!$args['entry']->post_id)
   return; //don't publish if not linked to a post

global $wpdb;
$wpdb->update($wpdb->posts, array('post_status' => 'publish'), array('ID' => $args['entry']->post_id));

}