I would suggest you temporarily remove that VAC program from the equation. I do not actually understand why you would want to use that in Sonar - not that you couldn't - I just do not see why one would.
It seems to be a file streaming application to move wav files and such from one program to another, with stream mix capabilities. (From my very brief read of something online for this).
So anyways - can you temporarily remove that Virtual Audio Cable software and then fire up Sonar's wave profiler?
Bob Bone