I think I have the same problem.  I am on amd64 proper and I installed
flashplugin-nonfree 9.0.48.0.2+really0ubuntu12.2 (from proposed-updates,
I guess?)

I get an insane amount of these error messages, and no sound:

ALSA lib ../../../src/pcm/pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open 
slave
ALSA lib ../../../src/pcm/pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open 
slave
ALSA lib ../../../src/pcm/pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open 
slave
ALSA lib ../../../src/pcm/pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open 
slave

Based on http://ubuntuforums.org/showthread.php?p=4289792 I am
speculating that the source of the problem is in Firefox, not in Adobe's
Flash player, though I'm prepared to stand corrected on that.

I also have Nvidia drivers, in case that it significant.  I thought I
saw mention of those in the Forum posts too.

-- 
No sound with adobe flashplayer 9 in Mozilla
https://bugs.launchpad.net/bugs/186726
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