Today I upgraded Kontakt from player 6.5.3 to 6.7.1. Now I have no sound coming back to my keyboard speakers. I see level lights working in Kontakt, my midi and audio settings are correct, usb cable is good, I would like to go back to the 6.5.1 but cant see how to do that. I have another older computer that runs 6.5.3 and sound comes through fine so its not my setup. I also tried player 7 and nothing works with that. Anyone have any idea what it could be and can I go back to an older version.Thanks for any help