Songbird URL redirection fails in OS X

I tried opening last.fm in Songbird using the given example here: http://wiki.songbirdnest.com/Releases... This fails using both Safari 4 and Firefox 3.5. Instead of Songbird opening a new tab, it opens a new window that's only a couple of pixels wide and maybe 10 pixels tall. It's almost invisible, but you can switch between it and the main window using the keyboard (Command + `). If you manage to click the bottom right corner of this tiny window, it expands slightly, to the point where there's at least a recognizable window and a title bar. If you resize it, you can see that the title of the window is "Hidden". Oddly enough, if I open just the base URL ( http://launch.songbirdnest.com/ ), it opens Songbird and brings up a blank page.

Obviously something is wrong here. Has URL support been dropped from Songbird? Are the instructions on that page out-of-date? Or is this a bug in the way Songbird is handling URLs in OS X?