Rekordbox and my new XDJ RX

You will have to be more specific. Are you talking about USB or link?

@Wezley > There are many places you can go wrong, which is why @Mitja is asking how you're using rekordbox with your XDJ-RX.

My recommendation would be to start with the user manuals for both the RX and rekordbox, and if you're still having problems, check out the rekordbox read-me article for additional information and for a series of questions we normally ask when trying to provide support.