Crossfader between player 1, 2, 3 and 4 does not work

Good Day,

One again congratulations and thank you for the new version 6, I just like the new look and the new added features.

I have noticed on the crossfader, that you can choose between player 1, 2, 3 or 4, where it should then crossfade between these players.

I have tried to choose the crossfade between player 1 and 3, but it still just play on 2 and 3.

Please advice, will appreciate.