I am not sure if it is a bug with elementary OS or with the new LibreOffice 5, but the LibreOffice GUI is broken. See the screenshot, where title bar is missing on unmaximised application window.
In case of maximized LibreOffice window, the menu-bar disappears. Also all dialog boxes are similarly broken. I do not currently have the maximized screenshot.
Is there any fix for menu and/or title bar?