Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Enable Right Click OSX Lion
When moving from windows to mac it takes people a lot of time to get used to not having a right click on there mouse well here is a step by step guide below on how to enable it on the latest OSX Lion
1.Open System Preferences
2. Click On Mouse Or Track Pad Depending On If Your On Laptop Or Desktop
3. You should see Secondary Click
Thats Your OSX Lion Done!
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