According to that description the issue is due to gtk2-engines-gtk-qt theme,
reassigning
** Changed in: Ubuntu
Sourcepackagename: None => gtk2-engines-gtk-qt
Assignee: Ubuntu Desktop Bugs => (unassigned)
Status: Needs Info => Unconfirmed
** Changed in: gtk2-engines-gtk-qt (Ubuntu)
Sourcepackagename: gtk2-engines-gtk-qt => gtk-qt-engine
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wnck-applet memory leak
https://launchpad.net/malone/bugs/37311
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