Hi,
and sorry for late response, we are investigating about this....it is so strange. With some site it works with some other not (also with a shared project and API key).

The error in browser console tells that missing API key, but the API key is present.

Now we have prepared for you a workaround, please follow these steps:
- Download and unzip the attached gmap.zip file
- Replace with new gmap.php file the old file placed in /administrator/components/com_jsn/helpers/fields/gmap.php

Basically with this change the file load the previous version of the Google Maps API, so
https://maps.googleapis.com/maps/api/js?libraries=places&;key=.... (before change)
https://maps.googleapis.com/maps/api/js?v=3.47&;libraries=places&key=.... (after change)

We will still investigate about this to release a new version that works.

Hi,
this is an expected behavior, to load fields Easy Profile load all .php files in this folder, so if you have more than one file with same classname then you will have a php error (rename file does not change the classname).