Frequently, file and directory ownerships change because someone edited the files as an administrator. When you create home directories for new users, be sure to make the user the owner of the dot (.) file in the home directory. When users do not own ".", they cannot create files in their own home directory.
Access problems can also arise when the group ownership changes or when a group of which a user is a member of, is deleted from the /etc/group database.
For information about how to change the permissions or ownership of a file that you are having problems accessing, see Chapter 1, Controlling Access to Files in Securing Files and Verifying File Integrity in Oracle Solaris 11.3.