not working if user leaves in the middle of a page

Plugin works beautifully saving pages of a multi-page form, after the user has left the page by clicking NEXT PAGE.

But if a user leaves or logs out in the middle of a page, that page’s data is not saved.

Help, please! I’d be happy to pay any developer reading this for a fix to this issue, BTW.

Best,
AD

http://wordpress.org/plugins/gravity-forms-data-persistence-add-on/