This is interesting: i rebooted from my old drive (which contails the original system foldfer from which i made a clone on a new drive). and exported a USB drive from my Rekordbox and guess what.. the waveforma and BPM show directly on the CDJ when loading a track in Rekordbox.
So this was the cause but i still don't know how to solve. Is there an old path in some file that i need to update? Od do i need to re-install Rekordbox? Or isn'tt this solvable at all without returning my system folder to my old drive? I hope not because i used an SSD drive for my system folder which makes my Mac a lot faster.