Running Rekordbox 5.2.2 on OS X 10.13.4, with 2x CDJ2000NXS2s
Firstly, I had to fall back to vers. 4.5.0 to get this setup to work.
Am running trial mode of Performance mode (thank God, cos I won't be paying for it in this state) and have set up a multi-output aggregate device on my Mac so that I can send audio from deck 1 out of one CDJ, and audio from deck 2 out the other CDJ into my DJM700.
Whatever Rekordbox 5.2.2 is doing, it's sending either decks' signal to both CDJs; albeit slightly quieter on the one that shouldn't be sending a signal at all. Falling back to 4.5.0 fixed this, and I was able to get signal from the corresponding CDJ without it spilling onto the other.
I can't understand why I had to set up an aggregate device to do this though? Surely a common set up would be for Rekordbox DJ to use each CDJ as a soundcard for each virtual deck? Even Virtual DJ is capable of this.
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This one might have been fixed in 5.2.2, but couldn't see it mentioned in the changelog since 4.5.0...
I was mixing both audio and video, and some 50 minutes into the set, Rekordbox would keep saying "Not Loaded" when I dragged a song onto any of the decks.. however, my CDJs *would* still play the song I had selected. With that though, I was seeing the wrong video on-screen, the wrong waveform, and the wrong time information on the CDJ... so I was DJing blind essentially.
It wasn't file corruption, as a) all my files come from the same source (Promo Only), and b) the very track that I dragged onto the deck played fine after a software restart. Didn't happen again that night, but until I restarted Rekordbox (after going to an emergency USB stick) that problem remained.
Not sure how Pioneer can charge money for such unstable software; not least given what we pay for the devices in the first place.