I have the Chromecast in my WLAN. At a Fritz box, in addition I have the Philips Hue lights, and I suspect that the apps like connect to this When I start a streaming of Chromecast although jumps to music but to play anything off and then comes to the playback "error when playing". This allows the error, of course, not find. Too bad, cool idea but does not work with me.
UPDATE: Since an update in the fall of 2014 the Chromecast more reliable, and there are now a lot more apps, such as the 7TV App or the Web Video Caster works (with which you can play back any Intenretvideos on the Chromecast), therefore there 2 stars instead of 4 stars again!