Sorry - still not done with computer build.  I should be done with that in about 2 hours, and am bumping this thread to let you know I did not forget about testing out that ensemble.
 
Thanks for hanging in there.
 
Bob Bone

@Sharke
 
I CAN confirm the same behavior for that particular ensemble in Sonar.
 
I imagine it is something within Reaktor itself, and TRIGGERED by something that the ensemble does that is different than other ensembles in Reaktor.
 
I have no solution to the issue, as I can't see the knobs and settings on that Reaktor screen very well at the moment, as I am using my smaller display screen of my computer.  I will take a look later on when I return to using both monitors of my system.  (my larger screen is a 46" HDTV).
 
Bob Bone
 

Thanks for checking. I just tried it in Reaper as well and it does the same thing, so at least we know it's not Sonar's fault.