Really weird: Just clicking into the account preferences did the trick. I didnt even adjust anything, but just opening the dialogue box, suddenly unlocked everything. Odd.
But thanks very very much guys! I really appreciate the help!
What on earth can be wrong? It happened like from one boot to the other, and now theres nothing I can do. I tried rebooting several times. I tried activating the different menus from their control in System Preferences... all didnt do anything.
Im on a macbook and running...