Update!
I recieved an response from Formidable Forms support. The following is their response:
This doesn’t look like a conflict or related to the update. Emails can be very unreliable when you use a dynamic email address in the “from” box. It would be best to move that into the “reply to” box, and use an email address in the “from” box that you know works on your site.
Here are more suggestions you can follow, including installing an SMTP plugin.
formidablepro.com/knowledgebase/why-arent-i-getting-any-emails/
I added the SMTP plugin as they suggested and all is working!
Thanks!