After updating to Mavericks, password can not be changed anymore

I upgraded to Mavericks and encountered a serious security problem. In system prefs it is no longer possible to change any of the security settings on the "general" tab. It is possible to change the checkmarks, but after closing the sys prefs, the changes are ignored and the screen saver and auto-login checkmarks re-appear. It is also impossible to go to the advanced settings. Off course: I did first click the lock and entered my password.
Furthermore in the Users and Groups section I can not change my password, name or anything crucial. Clicking the checkmarks or on "change password" does give a short "movement" but nothing happens.
Is there another cure than reformatting the HDD and have aa clean install? I did use the repair option two times, but that does not change anything anyhow. It even remembers the Safari cache; so far for a repair install. I also manually delete the system prefs cache manually, all with no result
I would appreciate the help.
Regards
Bob

Hi Bob van A,
If it is allowing you to make changes in some cases, but not retaining those changes, the first thing I would do would be a permissions repair (unclear if this is what you meant by "use[ed] the repair option", or if you meant a volume repair). You may find the following article helpful:
Apple Support: About Disk Utility's Repair Disk Permissions feature
http://support.apple.com/kb/ht1452
Also, if it will allow you to create a new admin user, you may want to see if the issue persists in the new user, which will help to narrow down the possible causes.
Regards,
- Brenden

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