Your request has been rejected by the Google Maps API server. The value specified in the request “sensor” parameter must be either “true” or “false”.
This is the error message that WP GPX Maps is giving me when i enter my web, http://21velocidad.es. It’s a new blog, with wordpress 3.5 and WP GPX Maps 1.1.38. When i uninstall the plugin, all come to normality.