A few days ago my Mac started acting up. First my password for a disk image wasn't working. I thought I simply forgot it, and after many attempts it finally opened (with the same password). Then I couldn't log into my admin user account with my master password. I had to reset my password with the FileVault recovery key. And now today, I can't log in again, and this time the computer refuses to even save my new passwords after I provide the recovery key. My Keychain is now de-linked (I tried clearing that too) and I can't log in unless I use the recovery key! What is going on? Please help.