[ubuntu] 12.04 app window's title bar hidden behind global menu bar

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http://ubuntuforums.org – I don't know which system update screwed this up, or maybe it has something to do with my disabling automatic window resizing when moving window to the edge, but now whenever I open a new application window, the top of it (the title bar portion, including the close/minimize/restore/maximize buttons) is always hidden behind the global menu bar. Attached is a picutre to illustrate this annoying problem. Now I can't move or resize the window using mouse any more. Can someone help please? Thanks in advance! Attached Images Screenshot.jpg (43.1 KB) (Hardware)