On Mountain Lion, when switching from any app. to finder, when getting to finder I could see my desktop, it no longer works what Have I done?

Well, I guess I wrote everything in the question.
But to repeat myself, when I first got Mountain Lion I was so sooth to see that when I was switching to finder from any other application (using the cmd+tabs buttons) I could see instantly my desktop meaning: the screen without any other windows, the desktop!! With the wall picture and the few folders lingering there.
But for some reason, it doesn't do it anymore...
Was it only an short appercu... only to make me hope that they finally... humm... some frustration with the ...
Anyhow I would appreciate any help.
Have a Mac Book Pro 2008 running Mac Os 10.8.1
4 RAM gigs
Thank you

Try the ML OS X community.
MacBook Pro 
https://discussions.apple.com/community/notebooks/macbook_pro  https://discussions.apple.com/community/mac_os
http://www.apple.com/support/macbookpro
Try Safe Boot, then see, and boot into ML Recovery too and check your system drive.

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    Thank you for your response which solved my problem. For other users who may stumble upon this, I'll clear up the confusion and share how I solved the problem with your help; When looking for answers to my computer problems, finding unresolved questions where person B offers a solution and person A never comes back and says "That worked, thank you.", it demonstrates a "k-thnx-bye" user mentality that leaves others with the same problem lost. Without further ado:
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    Yes.
    This is what I did and everything works perfectly. Thank you so much once again!
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