While not the green screen of death you describe. I get a blue image when using this on the site. The Google logo appears as does all the navigation but not the actual map.
I tried 'zooming-out' but no go.
As the administrator the map appears just fine within the Event add pages. But logged in as the administrator or logged out on the single view the map does not show up just that blue I previously described.
Edward L. Haletky