Gravity Forms pagination question

My company has taken over a new client whose WordPress site was done by a friend. This friend used a bunch of paid plugins, which is kind of a pain. I migrated it over to our server and now the only thing that doesn’t seem to be working is a paginated Gravity Forms form here: http://northpointfitness.com/index.php/start-today

Instead of going to the next section of the form, when you click “next” it redirects you to the homepage. I’ve tried editing the form a little to see if it just needed to be resaved for some reason, and I’ve also duplicated the form and tried that one instead, but it’s still just redirecting. I’ve also checked to see if all of my javascript is loading properly, and it is.

At this point my boss is considering just buying the plugin so I can ask on Gravity Form’s support forums, which is paid only. However, it seems silly to shell out $100 just to ask a question, so I’m wondering if you guys have any idea what would be causing this?

Thanks!