The desktop file sets Categories=net; which is not a valid category. XFCE doesn't recognise it and displays it under "other". $ desktop-file-validate /usr/share/applications/spicy-spice-gtk.desktop /usr/share/applications/spicy-spice-gtk.desktop: error: value "net;" for key "Categories" in group "Desktop Entry" contains an unregistered value "net"; values extending the format should start with "X-" /usr/share/applications/spicy-spice-gtk.desktop: error: (will be fatal in the future): value "net;" for key "Categories" in group "Desktop Entry" does not contain a registered main category Something like Categories=Network;RemoteAccess; would be appropriate for spicy, see <http://standards.freedesktop.org/menu-spec/latest/apa.html>.
Fixed in 0.7.159-r1, thanks.