Part of audio signal missing

I am not very technical. I have bought a WDTV to store my music collection on. It works well - I use a HDMI cable to connect the box to my tv and then have audio output to my stereo amplifier.

However, I have found that some audio files are missing one channel, often the main vocal. This does not affect all files. A good example are the Beatles from the new boxed set. Some files miss the main vocal while playing. I have swapped to stereo output for the audio (making the necessary changes in settings) and the problem persists.

Any ideas? Ian Batterham Australia

Since you have already selected the option for stereo output, check if you have the latest firmware update installed.