Comment 3 for bug 101942

I can confirm this. It also happens with the Beryl-Manager icon. It too is oversized.

In the Ubuntu-forums (http://ubuntuforums.org/showthread.php?t=400211) you reported, that Kicker won't change the number of lines, until another icon is added or removed. This aspect seems to be a problem with Kicker not updating the information for the system tray properly.

For an experiment, you can try lowering the height of the menu-bar. The system tray will usually continued to display two rows of icons, until something else happens in the system tray.