first of all this is a great plugin.
I have a problem using version 3.90: once the plugin is installed the custom customer attributes disappear from "registration page" and "customer info page".

In my case, for example, I need a custom attribute "Tax code" (as mandatory field); when i go to the registration page I cant see the field but when I try to save the system warn that Tax Code field is empty.

Any suggestion?
Thank you.