My current setup tells the focus to follow the mouse; this usually works.

But whenever the mouse goes over a shaded window, focus (visually) appears as locked to this shaded window: moving the mouse over any other window (and even clicking those windows) doesn't change the appearance of any titlebar. However, opening a new window resets the focus to a correct behaviour... until the mouse goes again over a shaded window.

I'm using Gnome on Mandriva 2008.0.
$ rpm -qa | grep -v devel | grep -E 'xorg|compiz|metacity' | sort
compiz-0.5.2-9mdv2008.0
compiz-decorator-gtk-0.5.2-9mdv2008.0
compiz-decorator-kde-0.5.2-9mdv2008.0
compiz-fusion-0.0.1-0.3mdv2008.0
compiz-fusion-plugins-extra-0.5.2-4mdv2008.0
compiz-fusion-plugins-main-0.5.2-4mdv2008.0
libcompiz0-0.5.2-9mdv2008.0
libcompizconfig0-0.5.2-2mdv2008.0
libcompizconfig-python-0.5.2-1mdv2008.0
libmetacity-private0-2.20.0-1mdv2008.0
metacity-2.20.0-1mdv2008.0
x11-server-xorg-1.3.0.0-24.1mdv2008.0