Version:            (using KDE 4.4.0)
Compiler:          gcc 4.3 
OS:                Linux
Installed from:    Archlinux Packages

First step is to configure which icons in system-tray should be visible and which should be hidden. After this is done, when you click to expand system-tray plasmoid it expands properly BUT most of the icons which were hidden are being render under the clock plasmoid. They stay there until expanding the clock to show calendar.
This behavior can be reproduced every time. Setting icons back to auto fixes the problem- icons do not longer render incorrectly. 
Expected behavior- icons should render only inside system-tray, not anywhere else.