Have you made sure that iTunes is allowed to share the XML?

And when using rekordbox, do you have iTunes closed?
Since a while I cannot get my Itunes playlists synced using RB. The playlists do show up in left menu when refreshed. When I try sync manager the playlists do not appear in the manager window. Sometimes when I close the window the Itunes playlists disappear from the menu on the left and I have to refresh it again. It tried relocate the XML file in the settings, but no effect. I can play the Itunes songs in RB, but cannot move them to my USB stick or other device. Any ideas?
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Have you made sure that iTunes is allowed to share the XML?

And when using rekordbox, do you have iTunes closed?
Share has always been on, and I tried turning it off and then on again, but no change. The individual playlists do not show up in the sync manager window...
They do show up on the side menu and can be played in RB itself oddly enough...
The other thing is that when I attach my device to sync it now wants to delete all the tracks it cannot find. It took me 15 minutes to cancel all those actions on my usb stick of 64 GB, but I actually had to force quit my 750 GB HD in order to let it stop because it would have taken forever. So at the moment I don't want to attach my HD and cannot sync anything until all those actions to delete have been cancelled.
After a few upgrades I still have the same issue. Itunes will not sync it's playlists in RB. This is very annoying! It used to work just perfectly, now since a few months it simply stopped working. I don't dare to hook up my large HD to it because it'll be prompting me that it cannot find all these playlists and that they will be deleted. So I am actually forced to not use Itunes at all any more, which is not very convenient because it will mean I'll have to maintain double playlists...double the work. No one has any other suggestions?