[Plugin: Weather Forecast – WP Wunderground] stopped working?

this awesome plugin recently stopped working for me when we changed servers. I am trying to get weather for the Cayman Islands and the error states:

<!– WP Wunderground Error : Weather feed was empty from http://api.wunderground.com/auto/wui/geo/ForecastXML/index.xml?query=Cayman Islands, British West Indies –>

I’ve also tried with just Cayman Islands which displays this error:

<!– WP Wunderground Error : Weather feed was empty from http://api.wunderground.com/auto/wui/geo/ForecastXML/index.xml?query=Cayman Islands –>

we are running PHP version 5.2.17

any help would be greatly appreciated!

http://wordpress.org/extend/plugins/wunderground/