Version: (using KDE 4.3.0) OS: Linux Installed from: Unlisted Binary Package Everytime you toggle the KWin effects, the plasma panel "grows" a bit. Also it doesn't matter whether the panel is on top or on bottom of the screen. I'm not sure, but this might be a dupe of https://bugs.kde.org/show_bug.cgi?id=181200 Thanks!
This is bug 184905, already fixed in 4.4 and 4.3.1. Thanks *** This bug has been marked as a duplicate of bug 184905 ***