reassign 727650 xfwm4 thanks This bug turns out to be a xfwm or xfce-panel bug. Apparently the window manager sometimes opens windows snapped to the top of the screen, even though there is a panel there, and so the panel obscures the window title bar. Seen this happen with both quodlibet (repeatedly) and evince (at least once).
This is in the default xfce configuration in Debian wheezy. -- see shy jo
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