I was attempting to configure an individual Fence, but when I went to select it from the drop-down, all that was showing was All Fences and --------- .

It had been working before. I uninstalled and reinstalled Fences, but had the same result. So I examined the most recent changes to see if they were the culprit.

As it turned out, I had renamed a Fence from "Calc / Temp / Trash" to "Calc | Temp | Trash". When I changed the name back, the list of Fences appeared in the drop-down list once again.

So apparently using the "|" (pipe) character is not an acceptable option in Fence names.