Why are menus in LibreOffice not rendering correctly and how can I fix this?

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http://askubuntu.com – With most programs, context (right-click) menus and other menus have a shadow under them to indicate that they're separate from the rest of the program. This makes them easy to read. In LibreOffice, however, menus don't have shadows, and the top menu (file/edit/view, etc) is still in the program window itself, instead of in the global menu. How can I fix these problems? This is on Kubuntu 11.10. (HowTos)