Audio playback issues on MacBook Pro

The right audio channel has suddenly stopped working on my MacBook Pro.... some of the time. If I use iTunes, DVD Player, Quicktime, VLC, or any media application, I only hear audio on the left channel. This is equally true whether I play audio through the speakers, or via the headphone jack. However when I restart the laptop, the startup tone is clearly heard through both speakers. I have tried resetting the PRAM and the SMC to no avail. Any guesses?
Thank you,
Jeff

Follow-up: it occurred to me that I didn't check the "Sound" Preference settings. It turns out that somehow the slider had set itself all the way to the left channel without my touching it -- I haven't used the balance slider in years, probably, if ever. Weird.... but problem solved.

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