I migrated an account from one Macbook to another (both Mountain Lion) using the account migration assistant. When starting the new macbook the account doesn't appear with the others on the login screen when starting up. I have to login to another account, logout and then it appears on the login screen. The login screen background also changes from white to textured grey/black background.
MacOS – My account is hidden from start login screen after migrating it to a new Macbook
login-screenmacosmigration-assistant
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Best Answer
From OS X: About FileVault 2:
In order to enable the migrated user for FileVault: