Appointments+ is no longer redirecting to thank you page after update

Hello,

I had another ticket open but there were multiple issues and only one was addressed so I'll open this ticket and another so they can be handled separately.

I recently updated Appointments+ to 1.7, WordPress to 4.5, and later Divi to help with my first issue. The form now works, users can select the date and enter their information and submit the form. However, users now see a Thank You popup and are not redirected to the custom thank you page that was setup in functions.php - but are instead brought back to the same page they started on. I do not want the popup, I want them to be redirected to the custom thank you page.

Please help.

Thanks,
Guy