Are you stuck with your Mac system and want to repair user permissions in Mac OS X ? If there is any issue with the user permissions you will not be able to access you personal or any other file, which is a kind of data loss. Previously the user permissions could be reset by using disk utility but now you have to use the reset password utility to repair user permissions in Mac OS X. You need to restart the Mac system and then while rebooting hold command + R button to initialize repair utility screen. Goto the top menu and click utilities and then select Terminal. In the terminal window you can type resetpassword. When the reset password utility is launched you have to select the Mac hard drive icon and then select user account. Now you have to click Reset Home Directory Permissions and ACLs, and finally click reset. You have now repair user permissions in Mac OS X. If the files are still not accessible then you have to use the Mac data recovery software to restore all the files back in your Mac system.