I'm having some strange issues on my MBP Retina running OS X 10.8.2.
The audio balance changes, and the right speaker is almost muted.
Anyone know what could be wrong here?
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I've had this problem on multiple MacBooks (from my old Powerbook 15 from 2003 to prior to finding this question on my late 2011 MBP 13").
Apple has acknowledged it as a bug when pressing the volume buttons during heavy CPU usage way back in OS 10.2! The solution was to go back to preferences and set it back where you wanted.
I have this exact same issue. mid-'12 rMBP 15'' 256/2.6/16GB. OS X 10.8.2
First noticed the sound issue with my ear monitors (Shure headphones) plugged into the computer: the sound in my R earbud was like 80% diminished. But the earbuds worked fine on my iPhone 5, perfect output in each side. Last night, while watching a Netflix movie (occasionally plugging in my earphones into the rMBP), the laptop's R speaker suddenly lost all output. I freaked out, obviously, but quickly discovered that the balance bar had been shifted 90% to the L. Funny how that just changed itself mid-movie watching. Also, after I fixed the slider bar and the laptop's speakers started functioning as normal, when I plugged my earbuds back in, I had to go BACK into Audio preferences again to change the balance bar. Strangely enough, it was shifted L again, but more like 50%, not as extreme as it was for the laptop's speakers themselves.
Absolutely a software bug.