Update OSX 10.9.2: audio balance constantly changes to the right

Question

Hi,
after the update to OSX 10.9.2 my audio balance constantly changes to a right side value. Whenever I center the balance manually the balance will change again to a right side value after a while. Can I do something about this?

Answer 1

Hello H.M. Mcluhan,
It sounds like the balance keeps going to the right speaker and needs to be constantly changed to center. I recommend starting by resetting your PRAM:
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information.
Then boot to Safe Mode, and restart the computer to test the issue again:
Starting up in Safe Mode
To start up into Safe Mode (to Safe Boot), follow these steps.
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key.
The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple logo and the progress indicator (looks like a spinning gear).
After the logo appears, you should see a progress bar during startup. This indicates that your computer is performing a directory check as part of Safe Mode.
To leave Safe Mode, restart your computer without holding any keys during startup.
From: OS X: What is Safe Boot, Safe Mode?
          http://support.apple.com/kb/HT1564?viewlocale=en_US
Thank you for using Apple Support Communities.
All the best,
Sterling