I can't open the lock on my system preferences

Hi
i'm in my system preferences and the lock doesn't want to unlock making me kind of stuck. can anyone help me?

weird is right, but what do we do ???
i have a similar problem.
when i press the lock to unlock it, it asks me for the password and than showes it as unlocked.
but even after that, it wont let me change any prefrences or setting.
meaning if i want to tweak with something, it just wont let me check or uncheck the setting.
who do i go to for a solution?

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