I just started with 4 deck mixing in Traktor Pro, but i noticed that deck C does not always sync when I tell it to. What i've done is mapped a button on my VCM-600 that plays a track and syncs it at the same time; a macro function. For deck A, B and D this works flawlessly, but deck D doesn't always listen. Sometimes it does, sometime it doesn't. Is this a bug in Traktor and has somebody encountered this problem also?