Some FLAC files won't play on Fuze+

[Astaroth6]

Hi,

I recently bought a Fuze and I have uploaded some FLAC files to it. Most of them are working but there are a couple of albums that are showing up as unknown artist and when I go to play the files (it recognizes the song titles) it tells me that the format is unsupported.

Should I try to reconvert these files? If so, what program should I use and how should I convert them?

Thanks.