I've seen this, what I have found is that if you "add links to media library" from within your browser(perhaps a MicroB issue?) this happens(named wrong), but if you click the link to play the url, it loads in media player then once it plays you can hold the stylus down on one of the streams(if there are more than 1 listed) and add to library there it seems to work fine...

I've been meaning to report this as a bug on maemo.org