Icon of "show desktop" panel applet not shown

[Bob Alexander <bob ngi it>]

The "hide all windows and show desktop" (same as Ctrl-D) applet on my 
lower panel shows a red cross on a white page and not the desktop icon 
it showed before.

Right clicking on it does not have a Properties dialog through which I 
could choose a new icon.

Using the panel->Right Click->"Add to panel" lists the "show desktop" 
applet but also here no icon.

The applet does work anyway.

Debian sid with Gnome 2.8.3

bob t40:~$ ls -l /usr/share/pixmaps/gnome-ccde*
-rw-r--r--  1 root root 3002 2005-03-04 19:34 
/usr/share/pixmaps/gnome-ccdesktop.png

which is a 84x49 pixels image that can be seen with Gimp.

Any help to fix this please ?

Thank you.

Bob