3 MAC PRO on wired ethernet network. - 1st runs OSX 10.8 - 2nd runs OSX 10.7 - 3rd old G5 with OSX 10.5 2nd one has SW RAID1 (2x 4TB hard drives). it's a shared drive with permissions sets to R/W to everybody other 2 computers connect to this to access TIFF and PSD files. This is at print / design company. initially all seems fine, but over time the permissions seems to degrade with the computers having issues saving or opening files from that volume because of insufficient privileges. i went there, restarted all computers, and propagated the permissions again on the shared drive. all seemed fine. now 2 weeks later i get a call it's doing same thing. they have 5000-10000 files in good folder structure on the shared drive. i can't think of what is causing this degradation. all they do is open the files in PS CS5, do the work, save and eventually print them.