Overview Grid not work in TS2

For some reason I can’t get the overview grid to activate. I’ve tried a hotkey, and a hotcorner… Even if I select it from the menubar icon, it simply does nothing. However, all the other parts of TS2 seem to be functional…

I have 10.9 and have 4 monitors hooked into my brand new MB Pro Retina.

Hi, does anything appear in the log in Console.app when you try to open the overview grid?