The weather app uses Yahoo to get it's weather. 2 days ago my weather stopped working. According to Yahoo's website they have changed the location address for some cities. Perth is obviously one of them. Since you can't choose where to get your weather from on the Weather app I can't see a fix in the short term. So no weather for now. It was never very accurate and always had different forecasts to the ones on the Yahoo website anyway. Still it was kinda handy to have. I don't use stocks but my map app still works fine as does mail, youtube and safari.