Routing inside midi yoke is in fact if you use midi-ox.
midi yoke is a stand alone virtual port that lets midi port accessible.
as desaxis is suggesting verify you ar on the right port, and remember that in vvvv CH 1 is 0, CH 2 is 1, etc… same thing for pitch.
certain user have had troubles by plaing too much with midi nodes, and set bin size to 0, stoping definitively the node to receive anything. my suggestion would be to recreate a midi node first.