Why my Ubuntu Workspace has turned weird?

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http://askubuntu.com – Since I believe (Im not sure) when I installed the latest nvidia driver (310.14) my ubuntu workspace has turned (weird) like this: http://imageshack.us/photo/my-images/152/capturadepantallade2013.png ..and I want to know if is there a fix to this?. I dont like this because somes programs whe I open them I can not access to them because I dont know where they are in my desktop. (HowTos)