CDJ Aggregator / El Capitan DVS Connection Issues

Just tried my 2000NSX2 and they are seen fine by the aggregator tool!

I had a similar problem a while ago, tried a few things including reseting the PRAM, seemed to do the trick. Here's a guide on how to do that: http://thenextweb.com/lifehacks/2010/12/04/how-when-why-to-reset-the-pram-smc-on-your-mac/#gref

nice one mate - will give that a try

Unfortunately this didn't work for me but really appreciate the suggestion mate

I've also tried creating my own aggregate in Audio Midi Setup but it doesn't even see the 900NXS when they are plugged in. 

Try repairing disk permissions, sometimes that does wonders to your system:

sudo /usr/libexec/repair_packages --repair --standard-pkgs --volume /

And why not do some periodic maintenance to rule out that as well:

sudo periodic daily weekly monthly

@Jay > You can also try removing the previous entries from the Audio MIDI Setup (if they show as "ghost" items), then rescan for devices.

thanks mate - I did try this but thats not worked either, still says ERROR. PLEASE CHECK YOUR DEVICE CONNECTIONS.

How do I rescan for devices?

I've done a scan and the Macbook can see the 2 devises: 

https://www.dropbox.com/s/52az8fwkzw7sboj/Screenshot%202016-08-08%2016.17.26.png?dl=0

So the laptop can see the CDJ's, but the CDJ Aggregator can't :(

Still works fine for the CDJ 2000 NSX2's but they don;t work with Traktor