Description of problem:

My girlfriend has a Macbook.  After updating her packages to-day (the first time
in a few weeks), the sound became crackly.  I wanted to quickly test
system-config-soundcard's default sound (once when my sound went crackly, I
found that s-c-s's demo sound was still clear!).  However, when I try, no sound
is produced!  I found this weird given that rhythmbox et al still can play sound.  

Version-Release number of selected component (if applicable):
system-config-soundcard-2.0.6-11.fc8

How reproducible:
Always, on her Macbook (not a problem on my Acer 5100)

Steps to Reproduce:
1. open s-c-s
2. click play button for demo
  
Actual results:
I hear nothing.

Expected results:
I should hear the pleasant demo sound.

Additional info:
I thought this might be related to pulse-audio, but to the best of my knowledge,
that is set up the same on both her and my laptop (it even "dies" just the same
after suspend, but that's related to haldaemon).  

scsrun.log reports:
"aplay: main:546: audio open error: Device or resource busy"
which I find odd, since I can open a separate terminal and play any .wav file
with aplay.  The sound is just crackly :(