Advice needed : flac file doesn't play

[ip8g_345]

I have few flac files which behave strangely :

They are played PERFECTLY on my computer and on Logitech Classic SB (straemed by logitech media server).

They can be played on Sansa Clip Zip but I hear many cracks.

They CAN'T be played on Cowon J3 at all

All of them are as follows ( by ffmpeg -i)

Duration: 00:08:30.66, bitrate: 416 kb/s
Stream #0.0: Audio: flac, 44100 Hz, 2 channels, s16

Any ideas what it might be ? I've never run into something like it.
Any tool to check the validity of files ( I don't know if this is the reason since as I mentioned they are fine on my computer and SB)

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