Since upgrading to Yosemite, I can't load mission control: - The fingers up move on the track pad doesn't do anything. - The hot corners do not work. - When I select an app in the dock, it doesn't go to the right space anymore. - I can't add / remove spaces, the icons for it do not appear. When I try to load mission control nothing happens, it quits instantly: no error, no console output, etc. I have attached a trace of the app, in case it can help find what is wrong: http://pastebin.com/0FRFf3Q8 I have no idea where to look!