Google map not loading

While adding/editing a property on the front end of the site we are having a problem displaying the Google map under the locations tab. It is working fine on the back end and we are able to set the Map locations there.

I have noted that the iframe source is coming out as src=”about:blank”, not sure if it might be the cause or if it could indicate of what the problem is.

The page I need help with: [log in to see the link]