The icon of nm-applet from NetwrokManager-gnome is not shown in Xfce systray when it (the systary) has no border. When it has border, icon is shown properly. Steps to reproduce: 1. Install NetwrokManager-gnome 2. Run nm-applet 3. Set the notification area to not show the border 4. No NM icon Turning border off and on again shows the icon off and on also. Reproduced on both Debian testing and Fedora 15 after upgrading to Xfce 4.8.
*** This bug has been marked as a duplicate of bug 7057 ***