i've noticed that AirPlay checkboxes in paprefs are grey and non clicable, even if pulseaudio-module-zeroconf and pulseaudio-module-raop are installed. There's a little 'Install' buttons right there, so if i go to software it is saying "Unfortunately, the "/usr/lib/pulse-13.99/modules/module-zeroconf-discover.so you were searching could not be found". Same with "module-raop-discover.so". Those libs are stored in /usr/lib/pulse-13.99.1 and linking them to ../pulse-13.99/ does the job. I hope, that i'm reporting this in right place, if no please sorry.
$ dpkg --list |grep 'paprefs\|pulseaudio-module'
ii paprefs 1.1-1build1 amd64 PulseAudio Preferences
ii pulseaudio-module-gsettings 1:13.99.1-1ubuntu1 amd64 GSettings module for PulseAudio sound server
ii pulseaudio-module-raop 1:13.99.1-1ubuntu1 amd64 RAOP module for PulseAudio sound server
ii pulseaudio-module-zeroconf 1:13.99.1-1ubuntu1 amd64 Zeroconf module for PulseAudio sound server
Status changed to 'Confirmed' because the bug affects multiple users.