I have added the GoogleMaps web part to a page template and I am having some trouble getting it to work properly. This page template is being used to render a custom document type I have created, to which I have added Latitude and Longitude fields, both of type Decimal.

In my page template, this is the markup for the web part:

<uc1:GoogleMaps ID="GoogleMaps1" runat="server" 
            GoogleMapsKey="ABQIAAAAGTAd5fdgdjMBbtyfxE4qixQQ_Mk-dH522FZHkubuoPKVeHrrqxTjJtIhI-VzyuDNfrasogA7x9BxUg"
            Width="500" 
            Height="400" 
            Scale="8" />

In my page template code-behind, I am setting the Latitude and Longitude properties in the Page_Load method:

DataRow row = CMSContext.CurrentDocument.DataRow;
GoogleMaps1.Latitude = Convert.ToDouble(row["Latitude"]);
GoogleMaps1.Longitude = Convert.ToDouble(row["Longitude"]);

When the page template renders, the Google Maps widget appears, but it doesn't actually display a map. All I get is a greyed-out area instead of a map, and no errors are thrown.

Here's an image of it:


Any ideas?