Sound balance reverting to right channel
I have a 2011 Macbook Air that I connect to a nonThunderbolt 27" Cinema Display via the Thunderbolt/USB ports from my Macbook Air.
Lately I've noticed that when I disconnect the Macbook and reconnect to the Cinema Display, the sound then comes from the right speaker only. Looking into system preferences the sound balance always reverts to the right channel only. I'm choosing the LED Cinema Display device for sound output.
No matter how many times I then correct this, the process repeats itself every time I disconnect and reconnect, I have to manually correct the sound balance.
Anyone else experienced similar?
MacBook Air, OS X Mountain Lion (10.8.2)