Explorer tab disappeared form my rekordbox.

Hi, 

My explorer tab suddenly disappeared and I can't seem to browse any of my internal files. 

Yesterday it was working just fine, but now it's gone and I can't seem to be able to add this.

Tried reinstalling Rekordbox, but nothing happened. 

It does work on my other mac, but not on this one - can someone please help?   

Without this function I can't add any more new files, which is extremely frustrating. 

Using Rekordbox V 6.8.3

Using