No audio from one channel

I have suddenly lost audio in one channel of the track. I tested the track with windows media player and it plays both channels, so this issue seems to be something with Showeditor, Any advice on how to resolve this issue will be greatly appreciated.

Thanks
Chris

Well after I made the post on this issue I decided to look for a new driver for the sound card in the computer. I found a newer generic drive from the sound card manufacture which I loaded and this resolved the issue. Not sure why the issue developed in the first place today, everything ran prefect yesterday.