As you mentioned yourself you changed settings yourself so its probably
not Ubuntu's fault. I think you will be able to get back to normal by
running this command in a terminal (considering you are using Ubuntu
12.04 and not 12.10)

$ unity --reset


** Changed in: unity (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1050139

Title:
  dash home disappears except for bar at top of screen

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