Comment 5 for bug 153305

I've got the same problem after Fiesty -> Gusty upgrade via 'update-manager -c'. After trying to add those items to my panel nothing happens. 'ps auxn | grep -i xfce' produces this:

    1000 29364 0.0 0.0 0 0 ? Z 16:03 0:00 [xfce4-systemloa] <defunct>
    1000 29365 0.0 0.0 0 0 ? Z 16:03 0:00 [xfce4-systemloa] <defunct>
    1000 30214 0.0 0.0 0 0 ? Z 16:14 0:00 [xfce4-mixer-plu] <defunct>
    1000 30215 0.0 0.0 0 0 ? Z 16:14 0:00 [xfce4-mixer-plu] <defunct>
    1000 30503 0.7 0.0 0 0 ? Z 16:17 0:00 [xfce4-netload-p] <defunct>
    1000 30504 0.5 0.0 0 0 ? Z 16:17 0:00 [xfce4-netload-p] <defunct>

Notice that after single item execution, ps shows two <defunct> processes.

Linux xidgex 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007 i686 GNU/Linux.
System is up to date (Xubuntu 7.10)