This is an 'improvement' courtesy of the kernel developers desperate attempts to make Linux work like Windows (ie everything automatic, no user control - except it doesn't always work).
If you go into 'Users and Groups' from the start menu then select your username then 'properties', do you have a tick against the item 'Administer System'?
If not put one there (the panel is greyed out until you click the key icon on the first screen).
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).