Here a follow up and the solution:
After reformatting the flash of my action mp4 player several times using different versions of mp3 player disk managers, the windows XP tools, the HPUSBFW.EXE and combinations of the before mentioned I finally managed to format my player to 1.9 GB and filled it with music.
Et voilá! even the latest files copied to the player play completely.
A miracle, but who cares...
I am still not able to move the slider in the mp3 player disk manager, but anyways..
Regards
Rich
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