I did some tinkering the last time I was in Fences. It rearranged all my icons into fences it created. And I discovered that if I try to move an item on the desktop to another spot it just snaps right back where it was. Exception: I can move it to a fence, but not just anywhere on the desktop.
For instance, my Trash icon ended up in the upper left corner. I want it in the lower right corner, where it's always been, but I can not move it there.