Based on my tests it is specifically the oxygen-gtk theme that has this problem. Every other theme in the default install works. Unfortunately, oxygen-gtk is the default setting for a vanilla Kubuntu Quantal install, so anyone using the latest Kubuntu is probably going to have this problem.
Based on my tests it is specifically the oxygen-gtk theme that has this problem. Every other theme in the default install works. Unfortunately, oxygen-gtk is the default setting for a vanilla Kubuntu Quantal install, so anyone using the latest Kubuntu is probably going to have this problem.