Rekordbox Pro-LINK "Empty Playlist" problem

So basically i encountered this problem playing a set just last night. I've searched around the forum a bit, and found people with similar problems (using old versions of Rekordbox though, like 2.2.4 or 3.0.x), so I thought I'd give it a shot to see if someone else can suggest a fix.

Let's get the basic details out of the way first.

DJ equipment is a pair of CDJ-2000Nxs, both running the latest firmware (version 1.41) and linked via a switch. A DJM-900Nxs is also connected to the switch.

My computer is a Windows 10 machine running the the latest Creators update, and running Rekordbox 4.4.0 (although i also tried updating to 4.5.0, the latest official release, and it didn't help).

Basically, the problem is that all Playlists or Playlist Folders on the CDJ shows as empty, even though in Rekordbox (under the "Playlist" columns, NOT the iTunes column), there's clearly songs in them. I can still browse the songs on the computer, and drag them to each CDJ and play them. But i cannot browse the playlists on the CDJ.

Pictures below shows a playlist called "Testing 1234" in Rekordbox, connected to the CDJ's via Pro-link. The playlist contains 6 songs.

https://photos.app.goo.gl/5zbdAujuRgvb6ZwX2 (Rekordbox)

https://photos.app.goo.gl/RW33Sb8acj8th7b42 (CDJ)

So far I've tried the following solutions:

• Renaming the playlist live (name change shows up on CDJ, but playlist is still empty)
• Creating a new playlist while Pro-Link is disabled, and then reconnecting Pro-Link
• Restarting Rekordbox
• Restarting the PC (and then Rekordbox of course)
• Restarting both CDJ's
• Updating to the latest official release of Rekordbox (4.5.0). The CDJ's are already running the newest firmware.

I haven't changed anything (settings or similar) in the software since the last time it worked.

Anyone got any suggestions?