I find I am unable to log into any account other than my current admin account, including a standard account I created a long time ago but rarely used, and a new account that I just created. The password is rejected. I have read in some places that this may be a symptom of a corrupted Netinfo database, but so far this seems like less than a definitive diagnosis and seems to lack a solution. I don't know when this started, but I am running 10.4.11 and am current with security updates. Any thoughts?