I then spent about an hour editing the files without listening to the sound (as I didn't need to and I need to listen out for my kids), and now that I want to do the final edit the right channel sound has gone - literally gone!
I went to waveEditor to see if I was mistaken but there it was - one long flat line in the right channel.
My auto saves do not go back far enough to work out when this happened ....
Any help or suggestions welcome, I don't want to have to go thorugh all the files and copy/paste the left channel into the right with waveEditor.
James