“….The file system directory in any of these disk image formats can become corrupted. This is usually as the result of an improper shutdown….”
http://www.thexlab.com/faqs/fixfilevault.html
Improper shutdown my ass!!! Yesterday evening I started my rsync-script which moved about 50 GB of flac-files from our MacBook to the external disk, which I have done many times before. Also knowing that after a period of inactivty after the script have finished the Mac would do a shutdown. No problem at all. So this morning I got up and wanted to unmount the disk, but for some reason it would not accept my well known password. After a few tries I rebooted the machine and voila…no account other than the guest account was available.
Did some research during the day and realized that I would maybe have been able to get around the problem if logging in using another account and then enable root…but…using the guest account, seems impossible. Fu¤%!!
Luckily I do not think we have lost much data, but am I really pissed – YES!!! We have bought according to my standards an expensive computer with an operating system as expensive as the hardware, and then I find info saying “…disk image formats can become corrupted…”. If it had been my Linux-distro which I have costed me…zero…I could have managed, but OS X…aaaaarrrghhhh!!!
So complete reinstall seems to be the only way…shoot!!!