Why are not all users shown on login screen on os x yosemite?

If you've activated FileVault, only the users that were authorized to unlock the startup volume will appear in the pre-startup authentication dialog. Once the system has started up, all users will appear in the login dialog.

To authorize more users after the volume has been encrypted, select the FileVault tab in the Security & Privacy preference pane. Click the lock icon in the lower left corner and authenticate to unlock the settings, if necessary. Click Enable Users...

You should only enable users whom you trust implicitly with all data on the system, not just their own data.

Hi, I am having the same problem. I have taken over a MacBook from my son. I have set myself up as a user but on login I can only see his account and guest.

I have to login as him and then change user to see my details.

If I try and enable users as suggested by Linc DavisI get a message "some users weren't added - the following users weren't allowed to unlock this disk because an unknown error occurred: David."

Any help would be greatly appreciated.

Thank you

David

You might want to start your own post since this one is from last year. A new post would be much more visible. You can link to this one.

Have you tried deleting your user and adding it back? Is the account an admin account or a standard account?

Thank you. It is an admin account. I will try deleting and adding again.

You are welcome.