Can't unlock System Preferences

Issue came with Yosemite: whenever I try to unlock any of of the Securirty & Privacy preferences, the lock unlocks itself for a fraction of a second and stays locked. I've noticed that if I actually set a password (instead of using no password) it works fine, so I assume it's just another bug.
I came across similar unsolved issues with previous OS versions.
Anyone else? Thanks.

Don't know, but IIRC, it's always been that way. This is from Snow Leopard.

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