If there are multiple icon instances of one application in your Mac’s Launchpad, then here is how to get rid of those duplicate instances:
- Delete, or you simply drag and drop the application from Launchpad to the trash. Lion OS will automatically remove all the icons in Launchpad related to that App.
- Then, simply drag and drop the App from the trash back to the applications folder. You will notice now there is only one icon for that App in your Launchpad.
I am hoping Apple will solve this problem soon.
OS X 10.6 or later does not have this problem anymore.