Applications that make use of audio (and by default, pulseaudio as their backend) fail in various ways.
mixer fails with:
radio also fails attempting to connect to Pulseaudio
mediaplayer fails to play streams resulting in log messages from gstreamer's pulseaudio plugin:
It turns out that the pulseaudio daemon never starts:
Further, the pulseaudio socket activation unit is not enabled:
I've confirmed on my 0512 build that pulseaudio is socket activated by reviewing the output of systemd-analyze and also noting that the server is running so something changed since that build date.