Using a folder shared between a MacBook Pro (running OX 10.7.5) and an iMac (running OS 10.10.1).
The shared folder contains jpgs. All of the jpgs are openable on the MBP but some are not openable on the iMac where they generate the error: ''The file myfilename.jpg couldn't be opened because you don't have permission to view it'. The other jpgs in the same shared folder open fine on the iMac.
Tried repairing disk permissions on both machines. Didn't resolve the problem.
How to fix this?