importing songs from rhythm box to ipod doesn't work properly

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http://askubuntu.com – I have imported songs from rhythm box to my ipod (32 Gb, 2nd generation). I can play them on the ipod without problem, but when I try to browse into the song (to go from 1 min to 5min for eg.), the song starts from the beginning (but the time continues at 5 min). Makes me think that the index of the file is corrupted. But I even don't know if such an index exists. Strangely, on Rhythmbox or Mplayer or whatever, everything goes fine. Did anybody experience that ? How can I solve this ? (HowTos)