Cannot log in after upgrading to 10.6

Question

I recently upgraded my MacBook to OS 10.6. The installation went fine and everything seemed to be in order. But when I powered off that night, then powered on the next day, the log in screen came on and I got a message saying "Your home folder, which is protected by FileVault, didn't open. It needs to be repaired. To repair the folder and continue logging in, click OK. To log in as a different user, click Cancel Login."
Since there is no other user, I click OK. Then I get a dialog box that says "You are unable to log in to the user account "(my account name)" at this time. Logging in to the account failed because an error occurred."
What is going on and how can I fix it?

Answer 1

You can try: Mac OS X 10.3_ 10.4- FileVault - How to verify or repair a home directory image.
Also, this:
Solving File Vault Related Problems
Syd Low offered a helpful tip about recoving damaged Mac OS X FileVault data:
Apple's knowledge base article on this problem - How to verify or repair a home directory image - didn't work for me. When you click repair at step 12 Disk Utilty will not be able to repair the volume because of permission problems. Here's what I did:
I added write permission using the command line. Open the Terminal (Utilities folder) and at the prompt enter the following commands pressing return at the end of each:
prompt > cd /Users/accountname
prompt > sudo chmod g+w accountname.sparseimage
You will be asked to enter your admin password. It will not be echoed.
prompt > sudo chmod g+w /Users/accountname
Now you can run Disk Utility to repair the image successfully. Remember to change the permissions back afterwards:
prompt > sudo chmod g-w accountname.sparseimage
prompt > sudo chmod g-w /Users/accountname
Also read the following in the event the above doesn't help:
FileVault-protected Home shows less capacity than what's available on the hard disk.
Some possible fixes if FileVault goes awry.