The problem is that the Google Maps Widget in iWeb and this is no longer supported by mobileme and wasn’t transitioned into iCloud.
The short answer to this question is to delete your google map widgets and replace them with a standard html snippet.
More detailed instructions? No problem
Go to google maps and search for the center of your map using your zip code or address’
Click on the Link icon
Copy the code titled “Paste HTML to embed in website”
If you’d like to change the size, zoom or appearance of the map then click on “Customise and preview embedded map.” and have a fiddle!
Go back to iWeb and delete your existing Google Maps widget.
Click the Show Media button (bottom right of screen) and drag and drop the HTML snippet widget onto your page.
Paste your text into the box and Click Apply!
Your new google map is now working again!