Here is http://websvn.kde.org/?view=revision&revision=406411 a commit by Aaron Seigo after which the buttons on the Kicker's taskbar ceased being visually pushed (in classical mode). Here is the key string in kicker/taskbar/taskcontainer.cpp: before: style().drawPrimitive(QStyle::PE_HeaderSection, p, QRect(0, 0, width(), height()), colors, sunken ? QStyle::Style_Down : QStyle::Style_Raised); after: style().drawPrimitive(QStyle::PE_HeaderSection, p, QRect(0, 0, width(), height()), colors) I restored the missing parameter and now it works well.