Good grief I've been trying to organize my playlists on both versions 3 and 4 new Rekordbox software running Macbook El Capitan and it's been several weeks of SHEER PAINFUL HELL. I have CDJ900s as well as the XDJ700 and have had to resort to selecting tracks on the actual players, Tagging them and then Creating unnamed playlists from there. Then I go to Rekordbox and it takes me 25 minutes to NAME the playlist. It would be quicker for me to hunt down 45 RPM 7" Vinyl versions of each song and just carry 3,000 singles with me again like in the good old days. Seriously frustrated as I've tried several computers and I have to Force Quit Rekordbox each and every time. Sometimes I get lucky and can name a playlist or God forbid actually drag a track into it from the software. But if it wasn't for the reliability of the CDjs I wouldn't be doing this at all. I also teach DJ Techniques at a local Music college and we use Pioneer gear but until this is sorted out properly I'll be telling my students to BEWARE.