I'm using AWN with the DockbarX applet.I have Display Launchers Only checked in the awn dock properties, but I'm still getting window icons displaying for certain apps when they're open. Any ideas?

Here's a screenshot, note the Firefox icon at the top of the bar (shaded icon) which is part of the DockbarX applet,then note it displaying again at the bottom of the bar (indicating an open window.) You can see from the Launchers list in the dock properties that it isn't in fact a launcher. (The Yahoo and Gmail launchers are standalone Prism apps, they don't use the FF Prism extension. And if I mouse over the bottom FF icon, it does display the title of the open Firefox window, not anything using Prism.)

Any ideas?