Could be - I'm wondering if something has gone amiss when they make the glass master, but it's not a process I know that much about because it happens in the factory. Then they press the CDs from that. It is really, really weird, and nothing I've come across before.

Thank you for the comment about the music - it's designed to be quite "close" sounding as it's for use in big halls where children have their sessions. We did 28 tracks in all, and it's been a lot of fun - this is the second run. The first run of 1500 was absolutely fine, but that was a physically different master (same company though, I think anyway - although saying that, the text font burned into the circle in the middle of the CD is a bit different, so maybe it's a different pressing factory.

I'm just trying to make sure they don't blame me for this. Really difficult when you have 1000 shrink-wrapped CDs sitting in front of you, all of them unusable!