I'm having issues with FileVault on my MacBook Pro. I have 4 user accounts, and I've successfully enabled FileVault on 3 of them, but it won't enable on my main (admin) account. It starts encrypting, and gets about 10% in, then an error comes up saying "There was an error during encryption (an error occurred during copying), FileVault will be turned off for this account". I'm then taken back to the login screen. I've tried this probably 10 times, and it always does exactly the same thing. I've been on the phone to an "expert" at Apple about it, for around 2 hours, but they're completely useless. Can anyone help?