compiz - Jun 2006 - There are artifacts when more than one window opened

When one window is opened and I am opening the second window and one of two
windows have big geometry or is maximized there artifacts covering new window.
see screenshot http://198.63.210.212/artifacts.png
when the first "non-artifacted" window is closed the second one
becomes to be properly.

FreeBSD 6.1, ATI Radeon Mobility 7500, driver "radeon"

-- 
br, Denis F. Latypoff.