Same problem here! I am, however, able to mirror the screen and audio together, but not only system audio, as was possible before.
Same problem here. I can't airplay to my Yamaha amp, but iTunes works ok, but it's a bit twitchy. Strangely, I was browsing Facebook earlier, and as I scrolled down past an auto-playing video, airplay clicked in automatically. Even more bizarrely my amp appears as an airplay device, in the drop-down bar, but doesn't appear in settings at all