Last night out of the blue one of my desktop widgets (i think it was either Battery or World Clock) stopped displaying anything, just an empty colored square. I tried to see what was the matter but then the entire set of widgets started flashing on and off. Trying to edit widgets doesn't bring up the little drawer at the bottom of the screen anymore. I tried restarting and that didn't fix anything. This morning I realized my notification center isn't working. Clicking on the clock does nothing whatsoever. Anyone have any ideas?