Think System is corrupted.
Try this:
Basically you create another admin account, which really is far too easy to do, but here we go:
Code:
(Remove all quotes before typing the commands I put here)
1) Start up in Single-User mode by type F8 on startup and typing -S
2) Type "/sbin/fsck -y", hit return, then type "/sbin/mount -wu /"
3) Once you have the prompt again type "cd /var/db/"
4) The prompt will change slightly. Then type "ls" and verify that somewhere in the table of items there is the file: ".AppleSetupDone"
5) Making sure that this file is there, then you can delete it by typing "rm ./.AppleSetupDone" or move it to the root of your hard drive for safekeeping by typing "mv ./.AppleSetupDone /"
6) Once it is no longer in place, type "reboot" and the computer will restart...and the first-run video will play and prompt you to register. You don't have to fill any of this in, you can just press Apple(ALT)+Q, confirm the dialog, and you'll be presented with a page where you set up a new admin account. Put in whatever you want, log in, and you can change the password on your main account.
Maybe this fix bug there...if not works, only way is reinstall entire OSX.
Goodluck,
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