I have similar problems. (See post "Transfer Interruptions Nh1 With Sonicstage 2.3, Play juttery & labelling of tracks very slow") Installed Sonicstage 2.3 on work PC, the juttery play not a problem on this machine. But I still have tracks that SS2.3 refuses to play. It just pauses for a long while (some kind of timeout) and then just skips to the next track? Very annoying - is it hardware or software? Wish I knew another NH1 owner to try and swap players.