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I launch lyx in gnome shell. With dual monitor, when I drag lyx window to one monitor and click menu item such as "File" , the menu doesn' t show up while accessible with keyboard shortcut (such as 'x' to exit in "File"). While if I drag lyx to another monitor, it is all fine. The two monitors are tiled vertically. The bottom one is the one with gnome panel, and is the one in which lyx menu does not show up.
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