Well - within Kontakt the problem has gone away. Oddly - I didn't change anything. It just stopped. But now I added Reason via rewire and ONE of my instruments in Reason is doing the same freakin thing (I have 2 Thor instruments inserted, sent out to 2 separate Sonar tracks). No matter what track in Sonar I select (kontakt, Reason or even an audio track) when I tap my Radium - I hear that same Reason instrument. Ugh. I'm seriously about to scream. This is the exact kind of thing that kills my creativity and makes me close Sonar and waste my evening on Facebook. I've done every suggestion here. Even closed the session and created a new one. Something strange happen every time. I'm sure it's probably something I'm missing, but to save my life I can't figure out what it is.