Click the lock to make changes NOT working?

[kkelly10]

Hi guys,
I have searched all over about this before and tried the numerous ideas of how to fix this problem, but nothing seems to work.
Here is what I have tried so far on terminal.
sudo killall -9 securityd
sudo pkill -HUP securityd
ssudo killall -HUP securityd
Also tried repairing the keychain access but it says there are no problems.

I am logged in as administrator, and never had this problem before and just noticed it when I couldn't install an app. I need to click the "install apps from anywhere" button on preferences/ security but can't make changes.

Any ideas?
Late 2012 Macbook Pro Build 13A603
OSX 10.9

Thanks
kkelly10

 

[Guy1717]

Strange, i have exactly the same problem since today
I spoke to soon.
I restarted and now it's fine again

 

[oplix]

same problem here. Will try restarting.