Paypal Advanced transaction not posting to the website database

I am using ecart 5.0.7 on a client's ecommerce website that is linked to Paypal Advanced for payments. The store has been working perfectly for the last couple of years. Recently, a purchase was made via the website and the payment info was recorded to Paypal, but the transaction did not get entered into the website database. The only thing that has changed recently was a new SSL certificate for the domain, no coding changes on any of the store related pages. The website store is : www.blackgatefarms.com/store.php
Any ideas regarding what I can check to resolve the problem?
thanks,
David Hampton

The SSL cert isn't installed properly. That could be the issue. I get an invalid cert error when I go to: https://www.blackgatefarms.com/store.php

If that is the only thing that has changed, it is very likely that is the cause of the problem.

Still a problem...

There were a few issues we found in a debug session.

It wasn't returning users to the https:// version of the site, which caused errors.

The email from wasn't set to an actual email address

The email to was entered with multiple email addresses comma separated and should be added as separate lines.

Correcting these issues seems to have resolved the problems.