If it is a gadget, as the OP states, it won't be listed in the navigator. In which case you'd have to go to "C:\Users\Jim Dillard\AppData\Local\Stardock\DesktopX\GadgetCache" using your info, of course, and delete the cache.
Then, in order to run the same gadget again, you may actually need to run a registry cleaner. I think this happened before and there is a thread about it. If memory serves, there is a registry entry that controls the persistence of placement of a gadget. So, without fixing the registry entry, the same gadget, run again, would still appear off screen.
If in fact it IS part of a theme, it is an object, not a widget. A WIDGET, run outside of a DX theme (all by itself) also wouldn't show in the navigator, unless it was imported into a desktop (becomes an object). The address above would then be used, except instead of gadget cache, you'd go to the widget cache.
I hope this is helpful and not too technical. But these very different scenarios would each produce different behaviors and need different fixes.
I'll see if I can find the thread mentioned above.
