OTbrandmaps do not works

Hi,
OTbrandmaps appears to be a very interesting joomla module, but do not works.
In admin I see a map, but into the site only a gray square with a message (google API not properly loaded).
If I re-open a pre-saved module (with parameters), I do not see those parameters, the module seems as new one.
How to do? Thanks.

NOTE: Joomla 3.7.5 with Gantry 4

Hi,
Please send ftp and admin infor to us contact@omegatheme.com
We’ll check for you

Hello!
Plz tell me how to center map to my PINS, because it load on China region, and change only when you click on map with mouse.