I’ve been approached by Gravity Forms users a lot lately with the same problem. Their forms stop sending emails after updating the plugin. The problem is caused by switching to the new ajax method of form submission. If you are facing the same problem, then its simple to solve it via a hook.
To force new AJAX submission for all Gravity Forms on your WordPress site, add the following code to your functions.php:
// new ajax in Gravity forms
add_filter( 'gform_form_args', function ( $args ) {
$args['submission_method'] = GFFormDisplay::SUBMISSION_METHOD_AJAX;
return $args;
} );
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