Mission Control does not work!!!!!!!!

Hi all,
I have recently Reformatted my mac and made it into 1 partition of 500gb just to run mac os x. I did it with the discs the laptop came with.
After OSx install was complete, I ran the os x lion downloaded from the app store and installed it too. After completely updating the system with software updates and my other software like ms office, vlc, flash, iLife etc.
I have found that the mission control does not work sometimes. It allows you to swipe from screen to screen but when when you swipe up.. It hides the top apple bar but nothing else happens.. Everything else is fine so far.
When I turn my mac on. If it gets stuck the only way to make it work again is to restart. Which is a bit annoying.. Plz tell me if it's a bug or something.
If that happens to someone else as well?
Thanks

Does it work ok if you create a new user?
To create a user account:
Choose Apple menu > System Preferences and click Users & Groups. Click the lock icon to unlock it, and type an administrator name and password.
Click the Add button below the list of accounts, choosing a type of account Standard is fine) from the New Account pop-up menu.

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