Hi Peter,
It was recently brought to my attention that the redirect="'.$redirect_url.'"
parameter on the frontend submission form is broken? I have confirmed this on production, staging and local development sites. I am using the very latest WP + MB Plugin + AIO plugin.
To re-create the issue
=======================
Add the following shortcode with a redirect param to a page template:
<?php
$redirect_url = esc_url( home_url( '/some-page/' ) );
echo do_shortcode('[mb_frontend_form id="contact-page" ajax="false" redirect="'.$redirect_url.'"]');
?>
After successful submission of the form you get the "White Screen of Death!".
I can confirm this parameter has been working fine for sometime without error, until recently.
I see nothing in my debug.log or browser console relating to this issue?
Can you confirm this at your end?
Cheers
Leo