Just noticed this error on ipad + iphone Im using V3 maps and noticed on map-render.php for v2 you are using an ampersand before this parameter, but on v3 there is no ampersand? could that be the reason for this error?
The google maps APi server rejected your request, the sensor parameter specified in the request should be set to either "true" or "false"
as per this post elsewhere.
where that last bit (&sensor=false) is the important bit. It's a new thing and that query parameter specifies whether you're on a location aware device (such as an iphone).