However, after I hand the Library back to the original user, should I then run Aperture's Repair Permissions? The order for this was:
Are you doing this tranfer from your own account? Then you will need some kind of permissions repair after you hand the library back to the original owner.
The problem: If you import working from your own user account, all imported images will belong to you as owner, not to your friend. All permissions refer to owner, groups, others. Any permission fix you do before you return the library will only effect the current owner, not your friend.
When you return the library to your friend, and place it into a folder on your friend's system, then change the ownership back, using your friend's account:
Open a Terminal (from Applications-> Utilities) and type:
chown -R $LOGNAME directory
directory is the path to the Aperture Library.
the simplest way to enter the path is:
First type "chown -R $LOGNAME " (including the blank), then drag the Aperture Library into the Terminal Window. This will expand the path to the Library, hit "return".
This command will change the ownership of all files inside the Library back to your friend's.
It may be necessary to do that with the prefix "sudo "; this will ensure Administrator rights, and you will be prompted for your password.
If there are still remaining permissions issues, then you can run "repair permissions".
Regards
Léonie