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The same thing happened to me. Go to settings- location- and make sure "Use wireless networks" is checked. I don't remember un checking that but I guess I did. I made sure that it was checked and it worked again.Hello,
The Clock and Weather together is just 1 widget. You go to HTC widgets and you add Clock #3/12. Then it asks you to select a City, either choose Current City (that doesn't work for me) or add a city.
I was thinking if you just have a gray rectangle and no City name, do you have all your Settings > Location options unchecked and it doesn't know where you are? Or do you have a City name in the box, but you get no weather icon (That's the problem I have), then you can remove and re-add the widget but this time Add a City instead of using Current City.