I really never thought I'd start a topic here.
I've been using a trick to try and a get the files to work which is to listen once before going to bed, then I have my iPod's alarm set to go off once I'm asleep. The iPod (In its base station) will then play the file again, whilst I'm asleep. For the past few nights I've been waking up on the '5, refreshed and awake' bit, dead on the end of the file.
Which means I'm listening right? something must be working. It's gonna start working right? Huh?