Updated Firmware to 01.01.29 and Lost Left Speaker

I upated to the latest firmware (01.01.29), and now my left speaker no longer works (and it did before).  This is a brand new 4 GB clip (had one week) that worked perfectly until this update, and still works perfectly except for the left speaker.  I saw another thread about left speaker problems, but it seemed to be about physical problems and not firmware updates.  Has anyone else had this problem related to the firmware update?  Is there any setting buried that I cannot find to set stereo vs. mono that isn’t just fm tuner related?  Any other suggestions?

Thanks for any and all assistance.

Try different headphones.

Try seating the headphone at a different position, perhaps its not plugged in properly.

The firmware has nothing to do with this.