I've not had any problems streaming via airplay either.
There are two other issues I've noted related to the iPad app, and I'm wondering if others have these as well:
1) In the playlist, album art is sometime wrong for a particular album. It seems that some album covers sometimes get replaced by another album cover in the playlist. (However, the "now playing" window (top left) is always correct.)
2) DSD albums have the songs sorted alphabetically rather than by the correct playing order on the album.