Not able to create new Playlists, Sience Engine 5.0

"Hi, I am unable to create new playlists. Since upgrading to Engine 5.0, most of my old playlists have disappeared, and I cannot edit any previous playlists from the left panel.

Sometimes, when I manage to create a playlist, I cannot rename or even delete it unless I do it directly from the controller. I tried connecting a brand-new, clean USB drive, but the exact same issue occurs. I also tried downgrading to version 4.3.4, but it didn’t help. I’m completely stuck and unable to work. This is very frustrating."