The right channel plays out master when the crossfader is over on the left channel, when the right channel slider is up. It does not do this when slider is down…
Look at the little ABCD boxes to the right and left of the crossfader on screen. It sounds like the right channel is unchecked. Default would be AC on the left, BD on the right. If this is not the issue, double check your midi mappings.
guys he’s using traktor 3 not traktor pro. 1st make sure that you are mixing in internal mode. 2nd make sure you have you audio card setup properly. Use outputs 1/2 for master and see if it work. Can you also post what kind of sound card you are using?