Mission Control not loading

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!

Can anyone run a trace of "Mission Control" for me? I want to see what it does as mine is not working at all.
The steps are as follow:
1) kill mission control so it's not running
sudo killall "Mission Control"
2) open a shell and type:
sudo dtruss -afs -n "Mission Control" > ~/Desktop/trussoutput.txt
3) load mission control
by clicking on the icon..
The output of the shell will go to a file called 'trussoutput.txt' on your desktop; if you could send me that file, or put the contents on pastebin.com, it would help be greatly in trying to figure out what is happening. Mine seems to be stopping abruptly after loading the GSS library...
thanks!

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Hi keclear,
If you would prefer that Mission Control not stack the open windows for each application, you may want to turn off the "Group windows by application" setting. You may find the following article helpful:
OS X Mountain Lion: Mission Control preferences
http://support.apple.com/kb/PH10850
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