How can i restore the 4 original workspaces in Ubuntustudio? Now i have only 1

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http://askubuntu.com – Ubuntustudio 12.04, kernel 3.2.0-23-low latency Hp Pavillion MS 220la AMD Athlon(tm) X2 Dual core Processor 3250e 1500MHz. When i last turned on the computer, i found only 1 workspace. At settings appeared 4 in number of workspaces, but only the workspace named 1. 3 other disappeared. When i first changed up the number from 1 up to 4 and i tried to name other workspaces nothing happened, just the workspace 1 had a name . It also dissapeared the header of program windows, where you can switch their size. Before this, i had the usual 4 workspaces and the window headers and that's what (HowTos)