Problem with my uvision3!

Can anybody help me.
It works OK yesterday.
But today when open My uvision3,I can't see project window / editor and output window at the same time.When I deselect "view-output window",then I can see project window and editor,but no output window.When I select "view-output window",then I can see output window,but no project window and editor.

What's wrong with it?

Thanks a lot!

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