seems that was a compiz issue and seems to have been fixed since
** Package changed: gnome-control-center (Ubuntu) => compiz (Ubuntu)
** Changed in: compiz (Ubuntu)
Importance: Undecided => Low
** Changed in: compiz (Ubuntu)
Status: New => Invalid
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** Attachment added: "Screenshot-1.png"
https://bugs.launchpad.net/bugs/695971/+attachment/1780236/+files/Screenshot-1.png
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