Have you upgraded the firmware? Check with this code after Serial.begin() in your setup. If upgraded, it should show version 1.1.0.
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// check firmware version
Serial.print(F("Firmware version: "));
Serial.println(WiFi.firmwareVersion());