Version: (using KDE 4.2.0) Installed from: Mandriva RPMs when you move the cursor on the cashew ( i think this is its name), there is some artefact ( only with qt 4.5 )
Created attachment 31291 [details] screenshot of the artefact
upstream issue.
On my machine, when it happens, the same artefact also affects the task switcher (taskbar) applet (and yes, I also see it in the "cashew"'s "more settings" popup as on Nicolas's screenshot).