Version: (using KDE 4.0.1) Installed from: Gentoo Packages OS: Linux Well, It's difficult to describe, so, here is an screenshot of the bug : http://arandil.free.fr/imgs/taskbar_bug.png If I hover again, to set the thumbnail over this bug, it disappears. If I open new windows, the bug shrinks... Hope it's clear enough... :)
It has been fixed on more recent revision (tested in trunk). Now it is ok.
Great ! ;)