I have just recently developed a Wordpress site with multiple forms using Gravity Forms. It was developed on a demo domain, and everything worked beautifully there. When I launched it, it was simply moved to a new domain on the same server, so the database did not move. I did change the url in the database, as I would do moving any Wordpress site.
Everything seemed ok until we tested submitting the forms. We have a general contact form in our footer. When you submit it, the footer disappears and the homepage banner breaks (because the javascript is in the footer). When you submit our newsletter sign up form from the side bar, the rest of the page content doesn't appear after the form. When submitting our quote inquiry form on our contact page or our file upload form, it shows an "internal server error" and, oddly, doesn't break the rest of the content.
Strangely, the forms actually submits the data, but to the user, it doesn't look successful....or make us look good.
I've tried deactivating and reactivating the plugin. I queried the database for the old url but found nothing that would affect the submission of forms. I tried re-saving the url info from the general settings page for the site. I've tried saving the forms again from within the admin with the hopes that it would flush the cache or replace any bad data. I tried creating a new form and placing it on a new test page, and it still broke, even though it was created in the new environment. Not sure what else to do. I'd rather not have to reinstall and recreate all of these forms...any suggestions?