beats1 not working with airplay in iTunes

I have several airport express connected with speakers. I usually listen music from itunes (in a Mac) all over the house. Everything works ok, but beats1. Every time I select Beats1, the airplay icon disappears and it can only be listened in the computer (or in the audio output selected in system preferences). If I choose anotther radio station or My Music, the airpplay icon reappears, and every thing goes back to normal.

Anybody else experiencing the same strange conflict?

bests

rol