Mission control doesn't work

Let me start with a little history for my problem. Some odd months ago Expose stopt working in OS 10.6, i couldn't get it to work with the F-keys and with the mousepad gestures. I searched the internet for some time and found some possible solutions.
I hoped that, with the instal of Lion, the Expose problem was gone due to the arrival of Mission Control. Unfortunatly Mission Control has the same issues. I can't get it to with the F-keys, hot corners or finger swipes. When I create a new user account in Lion, it works like a charm, but in my account it doesn't.
I googled for all kinds of solutions (fixing permissions with the disk utility app, rebooting, etc.) but nothing worked. Since it works in my other account of my MacBook, can't i just copy the files that makes it work in that account to my normal account? Or is there some other solution?
Thanks in advance!
Zuyp

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defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
defaults write com.apple.finder AppleShowAllFiles FALSE
killall Finder

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