[CentOS] SSH suddenly started failing :(

I had a few questions about your failed ssh logins. It appeared to me 
from the client log that you successfully authenticated but then the 
session immediately closed.

1. Can you login locally? (Maybe you can only login remotely?)
2. Can others ssh login normally?
3. Can you login as root or as someone else and then do "su -" to yourself?

Maybe your login shell is broken/missing/not-permitted? Maybe your 
homedir is missing (I don't think that should prevent login, though.)

Dan