Hi Ivo,
my colleague working on that, pleased me to post the problem that Google Map is not displayed:
The JS error is Google Maps API error: MissingKeyMapError
https://developers.google.com/maps/documentation/javascript/error-messages#missing-key-map-error
This means there is not Google maps API key but I added it in Gantry Google map practicle.
Can you help us with this error?
Thank you in advance.