Project Directory is Read Only!

Just installed 8.5 trial after abandoning Cubase at version 8 on OSX which ran poorly on OSX Mavericks, now I’m on El Capitan.

New version runs well, however, I cannot load many of my old projects as it tells me the Directory is read only, neither will it allow me to save back up to a new folder when I can load a song for the same reason.

Anyone any ideas? And yes, I’ve checked the folder attributes and made sure they are read write enabled.