Islandwalker on "[Plugin: Visual Form Builder] Confirmation not working at all"

Your form builder is wicked, but I'm having a hell of a time troubleshooting your confirmations.
Not only are confirmation emails not sending, but the confirmation redirect is not functioning either (it just stays at the same web address as the form but displays a blank page).
The redirect page is live and works, and the e-mail is correctly configured; as well, I have troubleshooted on IE, Firefox, and Chrome, all with the same results, so it's not an add-on. My site's theme isn't overly complicated, so I can't imagine that's the conflict.
Any thoughts? I know you've been asked a version of this question A LOT but if you have any pointers for me it'd be appreciated.

https://wordpress.org/plugins/visual-form-builder/