Airplay never really worked with Infuse 2 (video would often not start, and you’d have to skip a head before it would actually start to play), but it is completely unusual with Infuse 3 (on Apple TV 3, latest firmware). I’ve tried streaming from my NAS box to the TV and it would just give me an error “An error occurred loading this content. Try again later.” On the Airplay app itself, it would just be stuck spinning after which it would either stop playing and revert back to the list of videos or it would just crash the app.
Is it so hard to make airplay work with infuse? I use Beamer to stream content from my Mac to the Apple TV and it almost always work, quick, fast and reliably.