Unable to play one album in FLAC

I have a few albums on my Clip+ which are in FLAC and they play fine.

I transferred another album the other day and went to play all tracks but had no sound. 

All that happens is that each track is scrolled though one after another and with no sound

I transferred using MSC USB mode. I also tried MTP but still had the same problem.

It could have something to do with the ID tags perhaps -  would  that cause the scrolling with no  sound?

Thanks

All FLACs are not created equal. The HD 96 kHz/24 bit files you find lately on the web are not supported, only 16-bit FLAC files are.

It is a 16 bit FLAC file