Got a brand new Scala and play music via the USB socket from a flash drive. But oddly, whilst m4a files all play fine, many MP3s get a 'file type not supported' message and don't play, but other MP3s play fine. I've looked at the file details in as much detail as I can in iTunes on my Mac but there's nothing obviously different about the ones that don't play. But strangely, and it may be coincidence, but the ones that don't play don't have their cover art copied over, whereas the ones that do play, do, if that makes sense. No idea why cover art wouldn't copy from iTunes to the USB but maybe it's connected with the issue in some way? Thanks for any suggestions or pointers, cheers.

So for the benefit of others who may encounter this issue I have stumbled across a solution. I had been dragging the songs from my main iTunes library onto the USB stick. But if I drag them from the main iTunes app window instead the artwork copies across too (if it has artwork) and the tracks play fine. I suspect this may be a windows v mac issue at the bottom of the problem but have no idea why some files copy from the library folder fine but others don't.