Tobias:

As you stated, the problem was with a MIDI file and no RealTracks were involved so the settings you describe wouldn't apply to this situation.

As far as I can tell, it was simply a case of that particular song file becoming corrupt. Once I copied and pasted the chords and melody to a new file as per Peter and jford's suggestion, that G... "held" chord played just fine.

I haven't found any other files where a held MIDI chord wouldn't play as instructed and I can't seem to replicate the problem.

Thanks for your reminder about the RealTracks "hold" chords.

LLOYD S