Are you using the GoToWP plugin and now your forms submit but no registration shows in GoToWebinar? Here is how to fix
I had this problem, jumped over to my local environment (MAMP) and noticed this error comes up in the php log (seems to be db related hmmm)
Here is the fix
Uninstall and reinstall the plugin and this will fix the issue with the database tables – problem fixed.
What does GoToWP need to do?
The problem seems to be that the database needs to be upgraded when the plugin is updated, GoToWP most likely need to implement some kind of upgrade database migration tool a la Woocommerce.