Airplay not working

[Elemental]

Hello,
I installed the xbian beta 2 on my new Raspberry Pi. The main purpose of my Raspberry Pi is to act as a "Streaming receiver". I activated DLNA/UPNP and Airplay in the settings of xbian.

I can stream from my Windows 8 Notebook to xbian via DLNA, using a YouTube App.
I cannot stream from my iPad to xbian via Airplay, using the YouTube App.

I have an iPad Mini with iOS 7 and the official YouTube App. I can select xbian in the YouTube App, but the Video does not Show up on TV

Any ideas what could be the Problem?

thanks in advance
Elemental