The WebProp HF propagation indicator has not been updated since midday today. Since that time the update script has failed with an error saying that it is unable to resolve the host www.swpc.noaa.gov where the WWV solar weather reports come from. Since it can't get the data, it can't update WebProp.
I have opened a support ticket with the web host which has replied that there is a "problem with the server DNS." Hopefully the problem will be resolved shortly.