Only 10 addresses sorted, anything over returns 'unknown' for distance

Hey guys, really like this script but I have noticed from my own testing and from playing around with http://atxwebshow.com/coffeeshops/ that if more than 10 addresses appear only the first 10 sort by distance, the remaining ones return 'unknown' distance. Could be an issues with the key, but I am not familiar with the Google Map API.
