So, I am working on a site and JUST setup IPN for it and trying a test form for a $0.01 product. The payment goes through, I get an email about it, yet the entry does not save (empty).
I checked the IPN History and it says the two tests (so far) were sent, yet no entry saved.
I also should mention that I am using WordPress with Custom Post Types and Pages (the forms are embedded in Custom Post Type pages).
I was a little curious what the IPN ?page=xxx lands on. It just loads the index.php of the theme, and I wonder if GF functions are not catching the data sent to it.