It will be a permissions thing for sure. Check that the permission is "Applied to Enclosed Items" and also run Disk Utility and Repair Permissions.
Thank you for your reply Geoff.
I should have mentioned, I ran all permissions with the "Apply to Enclosed Items" checked, having had learned that little gem previously. I have also deleted Lightroom preferences to no avail.
I have run disc utility on the external hard drive to repair permissions and nothing changed/improved.
However, I have not run disc utility on the mac pro hard drive. Do I run any risk and if so, can you suggest any tips?
It sure seems like a permissions issue but I have not been able to solve it yet.
Thank you in advance,
Try the apply to enclosed at a level down or up, I had this issue and somehow that solved it. You will find the level that cracks it!!
Also run Disk Utility repair permissions on your Mac HD, it is designed to work especially on OS drives..... I do it periodically like cleaning!!
I had to apply permissions UP from where I was working.
Wow - that was a process because it had to re-do all permissions for almost five terabits of data.
Thanks Geoff the kiwi!
Now - to get some work done.