I found this one - Yeah!
"A bug has been fixed that prevented interaction between 3D tracks that were separated by an empty 2D track."
Serioulsy, this now means I can experiment with non-consecutive 3D tracks, throw and dupe tracks inbetween, leave tracks out, do what I call "dodge" scratchy tracks in or off line .. .basically it becomes more flexible AND I can see all this in almost realtime on my ext monitor . .
Thanks GALS & GUYS !
Grazie