Airplay from Mac: Picture but no sound

I have had Airplay working successfully with my MacBook Air and Apple TV for some weeks. Suddenly, I have lost the sound. The picture is being sent to the TV but the sound is stuck on the MacBook Air's tiny speakers. I have checked around but can see no reason for this sudden change. Anyone have ideas?
- Michel

It is possible the adaptor you are using isn't following the HDMI spec completely. Trying a different adaptor or updating the firmware or software on your TV may help.
Which brand HDMI adaptor are you using?
http://support.apple.com/kb/ht4241

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