Easysocial 2 : Type user fields

Hi,

I have one issue and several questions;

1 - with multitextbox : I have an error message on backend like : https://snag.gy/6oR7Hf.jpg and on frontend I have nothing.
2 - I would like insert a dropdown box within the group list (for one category) : It's possible ?
3 - How I can completed automaticly the city in fonction of zip code ?
4 - How I can show un textbox or textarea if a specail case is checked ?
5 - How I can add a multiline with mult field: like multibox but with 1 textarea + 1 dropdown + 1textbox (for example).

Thank's
Virginie