None of the XFCE goodies that I attempted to use work. They configure, compile and install perfectly, and I can select them from the "Add New Item"-list, but after selecting an item (such as the CPU Graph og Network Monitor) nothing happens, i.e. there is no new item on my panel. This only happens with items from the goodies-selection, not with the items that come with XFCE.
I installed from "xfce4-4.4RC2-installer.run" on a Slackware 11.0.0 system.
I rebooted (for a different reason) and then suddenly saw all the modules I had added were suddenly there now. So a reboot corrected whatever issues the system might have had -- however I'd still very much like to know what the reboot did to correct it.