Shortcuts keep Changing thumbnail/icon to default?

#1
I did not know where to put this so i put it here.
So,
Whenever i put a shortcut to open an application ANYWHERE, After about a couple of days it changes its thumbnail/icon to default looking thing.
like this, default.PNG
Or this on the task bar thingy http://i.stack.imgur.com/lwrjA.png
 


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