In Lion, there is an additional Repair Permissions application utility hidden away. This tool is located inside boot Repair Utilities. Here’s how to access it.
- Restart Lion and hold down the Command and R keys.
- You will boot into the Repair Utilities screen. On top, in the Menu Bar click the Utilities item then select Terminal.
- In the Terminal window, type resetpassword and hit Return.
- The Password reset utility launches, but you’re not going to reset the password. Instead, click on the icon for your Mac’s hard drive at the top. From the drop-down below it, select the user account where you are having issues.
- At the bottom of the window, you’ll see an area labeled ‘Reset Home Directory Permissions and ACLs’. Click the Reset button there.
This should be done for all user accounts and on all Macs that are involved in the synchronisation. If there is still an issue following the permission repair then have a look at the file(s) concerned. In my case there was still a corrupt file on one of the computers that I could delete. I knew it was corrupt as one computer said its size was 40kb and the other computer said 0kb, so I deleted the 0kb one.
Instructions courtesy of http://osxdaily.com/2011/11/15/repair-user-permissions-in-mac-os-x-lion/
If you would like help with this or any other fix for your Mac, then please contact The PC Support Group on +44 (0) 845 2233116.