I changed my quote to make it more explicit. 😉
I have the same problem with ACF not pro. I’m a teacher. Four in six students had this problem. I didn’t really understannd why some and not all of them.
The solution is almost the same:
As a temporary fix, you can follow these steps:
– get a Google API Key
– make sure the Google Maps Api’s are enabled:
Google Maps Directions API
Google Maps Distance Matrix API
Google Maps Elevation API
Google Maps Geocoding API
Google Maps JavaScript API
Google Places API Web Service
Google Static Maps API
– copy the generated API key
– open the input.min.js file located in the plugins folder of your WordPress-install (full path: /wp-content/plugins/advanced-custom-fields/js/input.min.js)
– find sensor=false&libraries=places and replace both instances (it’s present 2 times) with key=XXX&libraries=places (replace XXX with your own API key)
– enjoy!
IMPORTANT REMARK: as soon as you update the ACF plugin, the file will be overwritten and the key will be lost, hopefully there will be a proper solution in the next release of ACF