I've noticed that using gnome 2.10 many icon in gnome panel doesn't appear (gnome-bluetooth, porthole and other) this problem can be solved using an absolute path istead of a relive one for Icon= attribute in a .desktop file
For example in /usr/share/applications/gbonobo-browser.desktop I must use
instead of original
to view icon in gnome-panel
Steps to Reproduce:
file bugs + patches to those specific packs to their respective maintainers.