Problem with USB on Rekordbox

Hello,

I bought a new Mac and after downloading Rekordbox, everytime i put my USB key inside (with already lots of playlists in Rekordbox format), Rekordbox automatically erases all songs. I tried to uninstall and install again the application, same. I tried different USB keys, same. I navigated through the advanced settings and didn't find anything odd (no automatic export, for example), everything seems to be the same at it was on the previous computer, where I didn't have any problem.

Thanks for your help !