Use the same drive with Engine DJ (Desktop) and Engine DJ (OS) - Explained

I followed the above tutorial step by step. Everything worked fine, connected the external drive to my SC5000, rebooted my laptop, connected the external drive to my laptop again and… all my playlists are gone…

I still see them under the drive section, when I select my external harddrive, but I’m unable to add any new files to my collection.