I also have an issue with the Playlist import feature using DJM-REC with DJM900-Nxs2. It shows up as untitled for all of my tracks and I am also not able to edit the track information manually. I am playing on CDJ 2000 nxs2 and use the latest version of Rekordbox for my track information that gets reflected in the CDJs.
Is there a way to edit the information manually or have it so that the mixer picks up the name of the track automatically?