I, too, am having this same problem.
It initially let me fill in some of the customizations, but then, anything I’ve changed since, will not keep. For both the form and email solution tabs.
I’ve cleared my cache, cookies,, restarted and deactivated all 5 of the other plugins, and still, nothing. It’s not even reloading the wordpress page once I make changes and hit save.
Please help;)
Thank you,
Gina