Rekordbox 4.2.1 problem with iTunes 12.3.4.1

Thanks for reporting this.  Can you please tell me which version of iTunes is on each machine?  This will help us determine if the problem is being cause by OSX or by iTunes.

Mac Mini (Late 2012)
OS X El Capitan 10.11.5
iTunes 12.4.2.4
Rekordbox 4.2.1 rev.8297-9071-9067

iTunes playlists work fine

MacBook Air (Mid 2012)
OS X El Capitan 10.11.6
iTunes 12.4.3
Rekordbox 4.2.1 rev.8297-9071-9067

Itunes playlists only show the folders at first level and the playlists in each folder are empty

I downgraded the iTunes 12.4.3 to 12.4.2.4 in the MacBook Air (Keeping the OS X in 10.11.6) and the Playlists works fine again.

I think the problem is iTunes 12.4.3

Sorry for the delayed response.  Thank you for the information.  I will pass this information along to the engineering team.

@CoNE > 

This not is from the engineering team:

We are trying to reproduce the issue on a number of Macs but cannot yet.

One thing we found is that iTunes xml file is not always updated on time by iTunes. So, iTunes playlists on rekordbox may be updated by reloading iTunes Library.

We would like you to try to update iTunes to 12.4.3 on Mac Mini and check if the issue still occurs.

Can you also send us iTunes Library.itl and iTunes Library.xml when iTunes playlists in sub folder don't show on rekordbox?  

A DropBox link would be great.  Thank you!

Thank you for reply.

I re-install iTunes and now seems to work right.

I think maybe iTunes had blocked the Library and Rekordbox can't read the Playlists.