[XML Google Maps] – Get blank map screen

I have installed XML Google Maps (1.2) and then upgraded to 1.2.2. Every attempt to use a KML file is resulting in a blank map showing. I can see the navigation/altitude control, the Map | Satellite | Hybrid buttons, the Google icon and the Terms of Use link, but the map itself is grey. See towards the bottom of this blog entry.

I have tried the GPX file from the authors website and that works fine, so I assume that the plugin is configured correctly. I have tried the sample Javascript from the Google Maps API key page and it works, so the key is fine (and checked it’s valid in the plugin config). But I still get the grey screen.

The XML I’m testing against is fairly simple:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="https://earth.google.com/kml/2.0">
<Placemark>
<description>New York City</description>
<name>New York City</name>
<Point>
<coordinates>-74.006393,40.714172,0</coordinates>
</Point>
</Placemark>
</kml>


It’s straight off the Wikipedia article. I’ve tried a few others but get the same output. Could it be a typo in the XML, or have I misconfigured something to do with KML in the plugin. Is there any debugging option I can turn on in the plugin or WP to get more info?

Thanks.