PSYCHOS Applied the update. After my system had been up for about half an hour, all sound output stopped working. Any application that tried to output sound would freeze and require a manual kill. Couldn't even get to the Sound prefpane. I tried restarting coreaudiod, no effect. I slept and unslept the machine, no effect. I eventually rebooted, and the problem resolved.
I have never seen this happen before this update, so I suspect it may be linked since it happened right after I updated. Has anyone else had odd audio freezes like this?
I did zap my PRAM after the firmware update.
(Version 1.4)