The Google Maps APIs require an API key for new domains as of today. See announcement: http://googlegeodevelopers.blogspot.com.au/2016/06/building-for-scale-updates-to-google.html
- Drag the map widget onto your landing page
- Click the advanced edit on the map (the pencil)
- Click the <> source edit button
- Edit the line in the code that loads the Google Maps API to include your key as the value of a ‘key’ parameter. src="https://www.google.com/maps/embed/v1/place?key=<YOUR KEY>".