Media Catalog missing

I had recently upgrade to Artlantis v6.5 on Mac OS 10.13 and realised that the MEDIA CATALOG does not show any of the shades/materials/library.
I had also checked that the MEDIA FOLER PATH is correct.
Please HELP!!

Hello,
did you install the medias using the Media Installer ?
you upgraded from which version of Artlantis ?