I believe it's very common, as you can see in this thread:
http://ubuntuforums.org/showthread.php?p=5304421

A workaround in the thread is brought up:
"It's been said on here, just change to alsa mixer in sound prefs until PA 
fixed."

After fiddling with the sound pref's my sound is back.

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[intrepid alpha1] sound regression / no media playback on MacBook (second gen)
https://bugs.launchpad.net/bugs/244937
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