Version: (using KDE 4.1.1) Compiler: i686-pc-linux-gnu-4.3.1 OS: Linux Installed from: Gentoo Packages It occurs rarely and irregularly. It's most expectable just after locking widgets or in short time after it occured once.
I could confirm this in 4.1.0. (Another person did to at https://launchpad.net/bugs/255384) But if you're still seeing it in 4.1.1 it's probably still a problem.
It's still seen in 4.1.1, but hard to reproduce (even for me).