Great plugin. I have used other CPT, custom taxonomy and custom field plugins and yours my favorite so far.
Using the Types plugin I have created custom fields, added them to a group and attached the group to a CPT.
Everything works perfect if I add a CPT through WP editor (back-end).
I am creating a front-end input form using Gravity Forms (and the Gravity Forms + Custom Post Types plugin). When I try to assign a form field to an Existing Field Name none of the custom fields I created shows up.
Any ideas why the custom fields would not show up? Custom fields created with other plugins do show up (this is on a different site - Types is the only CPT plugin ever used on this site). I will be asking at the Gravity Forms forum as well.