Hello, I am on FC6 and have just experienced the same/similar problem with gnome-panel.
I was on a webpage that crashed so I had to force quit, it asked me something about reloading, but I thought it was the restore session question from firefox so chose the default option which was I think was 'don't reload' before I had read it properly.
This detached the fancy power icon (along with update package manager and the printer icon) from the upper right, next to the clock. I also had an icon for rhythmbox music player, but that just disappeared.
I couldn't find an option to get them back onto the panel so tried a restart, but now they have all disappeared. I assume they are still running as the box to tell me about updates still pops up (although now from the top left, as if it is coming from the fedora symbol). Also when I used to minimise the music player it would disappear from the lower panel and the icon would appear in the upper right, now it just stay in the lower panel.
Any ideas about what to do, or what this reload/don't reload question may have been?
What do I actually do with the file at /usr/share/gnome-power-manager?