Hi there, the deck D is muted here (I hear no sound but everything else looks exactly with the other decks A, B and C). Did a clean install of Windows 7 and Traktor 3.4.1.040 and it worked for a day, but at the second day it is muted again. Any thoughts? Thank you Hannes EDIT: This happens in internal mixer mode. However even if I switch to external mixer mode and route deck D to an output it is silent. Nada.