Changed user name but files are now unaccessible I changed the home user name using http://support.apple.com/kb/ht1428 and now search in Mail and Finder only show me files I've accessed since the change. This is a major issue for me. 

How can I fix this OR revert back safely? 

I use Time Machine but my attempt to restore to the time before I made the change did not work.
Make sure that all the permissions are correct on your home folder.
You can use the ACL tool on the Recovery HD to do this:


Boot into the Recovery HD using ⌘R.
Run resetpassword in Terminal (available from Utilities → Terminal).
Select your account from the drop-down list.
Click the Reset button for Reset Home Directory Permissions and ACLs.