Launchpad Gestures doesn't work after install Lion

Hey people, I have this problem, after install Lion all gestures works properly, but Launchpad and Show desktop doesn't work even with the option in the Trackpad enabled.
Anybody can help me please.
Kind regards.

Here are my best suggestions for your camera problem:
• If Apple's http://support.apple.com/kb/HT2090
   suggestions do not help you, continue with the following.
• Use Disk Utility to repair permissions and then
   download and apply the 10.7.2 Combo Update:
     http://support.apple.com/kb/DL1459
• Repair permissions again immediately following the system restart
   that completes the Combo update.
The Combo version of updates can sometimes correct
strange problems like yours.
For camera problems in web video, you may need to update to the current version of Flash: http://www.adobe.com/software/flash/about/
If you need to update Flash, follow Adobe's instructions and uninstall your old Flash before installing the new one: http://kb2.adobe.com/cps/908/cpsid_90893.html

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Launchpad Gestures doesn't work after install Lion

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