Also FYI if it matters I'm hooking it up from my MacBook into the USB-B port on the back of the CDJs. I haven't tried connecting my computer into the USB-A port on the CDJs but I couldn't find anything that says you can't use the USB-B...
CDJ-3000 link issues with laptop
When I plug in my laptop directly to a CDJ-3000 via the USB it doesn't show up in the other linked players (using Pro Link). I assume Pro Link is working fine because the players will all read a normal USB stick via the link and all sync features work fine. But my laptop only shows up on whichever player it is directly wired into. I connected it to each player individually and it reads it just fine for that individual player, but I just can't access it on any other linked players.
My bad - just realized this isn't compatible in Performance Mode. Switched it to Export and seems to work as expected.