Lion programs preferences can't be changed

Hi everybody,
I have a strange behavior of Lion since a while.
I can't modifiy any programm settings.
Means that all programs lose the modifications I have done since last start.
Examples: Safari starts with same page which is not the home page, lose updated Extensions etc
                 Mail is not able to store a passwords or connect to a new email account I created.
                 new WIFI Access points passwords are not stored.
I have already tried to delete the preferences files in the library/preference folder with no effect.
I have tried to reasinge the user to all the personal folders and ensure that read and write access is granted.
I have tried to repair the access rights of the volume.
Has anyone any idea who this could be solved?
I could only think of creating a new user and moving data over to him.
I am afraid that when I don't find the cause of the problem it will happen again.
Any hint would be appreciated
Regards
                    Alex

Examples: Safari starts with same page which is not the home page
Alex...
Disable Resume >  How To Disable Lion's 'Resume' Feature - MacRumors.com
  Mail is not able to store a passwords
Open Keychain Access  /Applications/Utilities
Select Passwords on the left. Delete your current mail keychain. You can do that by right or control clicking the keychain then click Delete.
Now open Mac Mail. From the menu bar click Mail / Preferences then select the Accounts tab then the Account Information tab.
Type in the correct password. You should see a pop up asking to save that to a new keychain, click Yes.
new WIFI Access points passwords are not stored.
Back to Keychain Access.
Locate the your base station or Wi-Fi network keychain. Delete the current keychain.
Now open AirPort Utlities  /Applications/Utilities
Select your network on the left then click Manual Setup. Select AirPort from the menu then select the Wireless tab.
Type in the correct password, then again to verify. Then select:  Remember this password in my keychain

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