I tried BBC Radios 1,2,3,4, and about 10 other stations picked at random. How do I know which is a "popular stream that must be available"?That's how you start a stream. Some streams can be offline or not available. Because there are >50k streams, nobody can track this.
Try a popular stream that must be available. I just tried some streams and they are working for me.
Oh, by the way, the new WMC skin folder did not persuade WMC to put WebRadio in the audio section - it is still in Extras. Not that that's a big problem, but I thought you ought to know.