When I playback everything is working great. If I mixdown it appears as though everything is mixing (you can see the midi notes playback) but on playback of that mix Polyplex, in Reaktor, is not there. I have also tried right clicking the midi track and mixing the selection from there with no luck (mixed track has no audio). Same results if I solo the track.
Polyplex works in the player of Native Instruments Reaktor.