Hi Boris,
You made a very nice plugin, but I also have the same problem after the update. You can see it on this page : https://www.investman.fr/.
In addition to that, you can take a look to Google results to have an idea of the number of websites which have the same problem : https://www.google.com/search?q=%22wp-content%2Fplugins%2Foptin-forms%2Fincludes%2Ffunctions-forms.php%22.
Do you think if you make another update, you can solve the problem ?
Thanks
