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

  1. Create an API key as per instructions here: https://developers.google.com/maps/documentation/javascript/get-api-key
  2. Drag the map widget onto your landing page
  3. Click the advanced edit on the map (the pencil)
  4. Click the <> source edit button
  5. 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>".