When I turn on Compiz with the Compiz tray switcher and I use Clearlooks, Dust Sand, or possibly any title bar style that normally has window icons on right, some window title bars will not change. Instead, they stay selected or unselected randomly. Some windows, like Ubuntu Software Center and CCSM are unaffected. This problem only happens with GTK window manager. I am using the Malteworld compiz ppa for Emerald.
The problem does not happen with plain Metacity, or a title bar style that normally has close button on right.
Edit: It still happens with Emerald. Reinstalled with upgrade option (yeah, 11.04 to 11.04) and still same problem. So maybe faulty package?