Version: (using Devel) Installed from: Compiled sources double sized-pixels: incorrect buttons rendering Originated from: http://bugs.kde.org/show_bug.cgi?id=166646#c2 Go to sys.settings and use double pixel size for icons. It will change the icon size but not the element size.
double sized pixel icons are now gone; the a11y people say they were obsoleted by things like monochrom icons and the kwin zoom tools.