Can't open system lock icon
Dear community
I bought a Macbook pro not long ago and I wanted to change some preferences in the system settings but for example when I try to click on System settings -> Security and then try to click on the lock icon it just keeps saying 'accepting' but nothing happens after that.
I really hope that you can help me
Best regards
Thekyo
MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10.3)