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I'll ask you to please file an inquiry ticket here and our rekordbox support team will be able to gather some additional information to assist you in resolving this issue.
Hello everyone, how are you today?
Rekordbox is not updating the iTunes library on my Mac. Last night I opened Rekordbox and the 2 new playlist that I have included into iTunes library was not showing on iTunes tree in Rekordbox.
I'm running Mac OS Sierra 10.12.6, Rekordbox 5.2.0 and iTunes 12.7.3.
I already try all kind of fix that I know, like unchecking Share iTunes Library XML with other applications option on iTunes preferences, closing the program, opening again, checking again and nothing...
Hope someone can help with this issue... thanks!!!!
I'll ask you to please file an inquiry ticket here and our rekordbox support team will be able to gather some additional information to assist you in resolving this issue.
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Try refreshing the iTunes library within rekordbox.

I already tried this, it's not working at all.....
Did you change this in your iTunes preferences?

Yes, this wasn't happening before... everything was working fine, but from nothing it started....
Is the proper iTunes Library File selected in Preferences > Advanced > iTunes?
Yes it is. I even renamed the library so iTunes could rebuild it and still getting the same problem. It's not showing the new playlist's....