Weather underground widget hangs

I have recently upgraded my flex sites from 2.5 to 3.1. The Weather Underground widget was working until just recently (after upgrade). I have my Flex Build Path set to a local IIS folder (output folder) and local URL for the Output folder URL, following the ArcGIS for Flex developer guide, i.e., C:\Inetpub\wwwroot\flexviewerdebug, and http://localhost/flexviewerdebug. Now, the Weather Underground widget just hangs when I launch it. If I take the output folder URL out of the Build Path, the widget launches, but does not display the forecast or the satellite info.
I know there is a simple solution, but I have not found it yet...
Chris