OK. It finally works.
changed permissions on:
Adobe Photoshop CS folder (this spelling)
Adobe Photoshop App. (this spelling)
to read/write for all.
path: Mac HD/users/robertellison/APPLICATIONS/ Adobe Photoshop CS/Adobe Photoshop CS
Moved ZBrushx2.0 (original spelling of folder) to:
Mac HD/Users
Path: MacHD/Users/ZBrushX2.0
Changed permissions on ZBrushX2.0 folder,
ZBrush.app
ZStartup
ZPlugs
ZAppLink.zcs
ZAppLinkData
all files in ZAppDatata folder to read/write
changed opening app on all psd files in ZAppLinkDate folderto Photoshop CS (but it reverted to not applicable) so I left it there
Path:MacHD/Users/ZBrushX2.0/ZVrush2/ZStartup/ZPlugs/ (here I installed ZAppLink.zsc
and ZappLinkData folder)
I think that covers everything.
It seems that moving ZBrushX2.0 directly into Users folder was what made it work.
Robert