Lion audio dropouts with external speakers?

Since I installed OS 10.7.3 (upgraded from 10.6.8), I get audio dropouts whenever I use external speakers.  I use my Mini (purchased a year ago in Feb 2011) connected to my TV for Skype, Netflix, and listening to iTunes, so this effectively eliminates my ability to use it.  I don't get dropouts if I use the internal speakers, and it doesn't seem to matter whether I'm using iTunes to play something resident on the internal hard drive or watching something on Netflix streaming over wifi, or whether I have wifi or bluetooth on or off.  The external speakers are run through an HDMI cable connecting the computer and the TV.

Updates applied, at least one of which caused reccurrence of my audio dropout problem (I'm guessing iTunes is the culprit):
iPhoto Update 9.2.2
GarageBand Update 6.0.5
Digital Camera Raw Compatibility Update 3.10
Application Loader 2.5.1
Safari 5.1.4
iTunes 10.6

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