Within your Weather Watcher\Skins\Forecasts\Splendid folder, if that is the skin you are using, are there four html files? One for Current, Hourly, Detailed and Daily? Can you open them with IE?
Are there any errors in your firewall or AV logs pertaining to WW.exe or DL.exe?
Is this a fresh install or an upgrade to WW 5.6.14?
decibel said that “Update, Maps, alerts and options are OK”. You said that the Current, Hourly and Daily buttons use Javascript. I don’t know about the Update and Options buttons but I would think that the Maps and Alerts buttons would use Javascript also and if they work why would Javascript not work for the Current, Daily, Hourly buttons?