David,
I ran into the same sort of issue. Mine turned out to be that the page that I was 'testing' was not publicly available on my website. To make this work, your form page needs to be publicly available.
I ended up making the page available, but didn't put it into the menu structure. What was happening in my case:
1) I posted and paid via PayPal
2) When PayPal finishes, it will turn around and 'load' your form to send the reply. That reply is basically paypal visiting the page on your website. (Your example, paypal will 'Browse' to
http://lovelearning.wowinteractive2...uleID=1149 which needs to be publicly available or it will not succeed.
Don't know if that is what you are seeing, but this one took a while to figure out in my case.
Kevin