Hi Toni,
I'm trying to understand How to solve the problem and I'm doing many attemps.
I have discovered that if I use for example an mp3 track along with a Smart track if Smart drag the Smart to adjust its length, it no longer plays, as mentioned earlier, but if I go to play for a second the mp3 track then also the dragged Smart track plays
Other experience:
My manual only says to enter duration before putting the Smart track on the timeline,
but if I do it and then make other editing operations (not on the Smart track) I
obtain no sound again
Please can You say me wich is the correct way to use Smart sound tracks???
do I make some mistake?