When you try to open or upgrade iPhoto, you might see a message like this:
“There is a problem accessing one or more files in your iPhoto Library folder. Do you want iPhoto to repair permissions for this library for you?”
This usually means that one or more of the iPhoto files or folders are locked or the settings don’t give permission for opening or editing them.
Important: The Repair Permissions function of Disk Utility won’t correct this issue.
To correct a permissions issue:
Quit iPhoto, if it’s open.
Hold down the Command and Option keys as you click the iPhoto icon.
The “Rebuild Photo Library” dialog appears.
Select the “Examine and repair iPhoto Library file permissions” checkbox.
For information about the remaining checkboxes, visit the iPhoto Support website.
It may take a few moments for iPhoto to finish checking your library for permissions errors and locked files or folders. When iPhoto opens, you should be able to use your iPhoto library.