Can't log back into user

I have an iMac 20" 2.4GHz Core 2 Duo. I was upgraded to Leopard a year ago. It has four user logins.
The problem I'm having is with logging into one particular user. I have no issue booting up the computer and logging into this one user account (User A) - everything is fine. But, if I switch to another user (User B) and login (again no problems), then let the computer go into screen saverand the home login screen, I can't login as User A. I get a black screen and a mouse color-wheel - just stays that way. If I hit the power button, I can get back to the login screen, but still can't login to User A - same issue. If I login to any other user, no problem. I have to force a shutdown to be able to login to User A, then it logs in normally.
Of the four users, this never happens. It is only logging in as this one user where the problem occurs. If the user logs out, no problem. But if the user leaves the computer, the screensaver kicks in, another user logs in, then I can never get back into this one account.
Nothing is running in this one users login that is different than other users. I have tried disabling Time Machine and other applications and can't narrow down a solution. I don't see anything unusual in the logs.
I've tried searching the discussions and troubleshooting section and can't find this same problem. Any help would be appreciated.

Make sure that you haven't saved Uppercase and Lowercase versions of that name and password.
Remove saved Password(s):
* Firefox > Preferences > Security: Passwords: "Saved Passwords" > "Show Passwords"
*http://kb.mozillazine.org/Password_Manager

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