I don’t have the time to debug more right now (perhaps tomorrow)
A quick fix is to replace in hidden.php on line 28
add_action(‘plugins_loaded’, ‘contact_form_7_hidden_fields’, 10);
with
add_action( ‘wpcf7_init’, ‘contact_form_7_hidden_fields’, 10 );
This adds the function to contact form 7 initialization instead of the other hook
(assuming you are of course using the contact-form-7-modules plugin)
