I've been a happy user of Fences since its first release.  I haven't taken advantage of every feature, but I haven't had any trouble with it at all, until recently. I would definitely recommend it. 

However, sometime recently (i.e. after an update sometime in the last few months), I've had trouble adding a new icon to the end of a fence.  No matter where I release it, even if I leave room for 2 or more icons to be added, it never remains at the end. 

Some specifics: I have a fence with 11 folders (first) and then 7 program shortcuts for a total of 18 icons in the fence. If I install something and drag its desktop shortcut from my new items folder to this fence, even if I release the drag well past and below the last item, it adds the new item to the middle of the list (as the 10th of now 19 icons), after the 9th folder. So there are two more folders (F) after it and then the original 7 shortcuts (S), all after it.  So I have:

F F F F F F F F F F F S S S S S S S

and I drag a new shortcut (N) to the end:

F F F F F F F F F N F F S S S S S S S

I say "doh!" and grab that one from the middle and move it to the end again and let go of the mouse drag and ... it goes back in that position in the middle.

I cannot get it to go where I want.  Unless...

The window is just tall enough for one row of icons. It's at the bottom my screen. If I resize it to be taller, by moving the top border higher so that there are two rows, it all works fine. 

Well not really: I would expect that if I drag something anywhere on the second row, it would end up on the end of the icon list but it gets inserted into the position in the row, above where I release it.  As if the first row of icons had infinite height (or at least 2 rows tall).  So if I make the fence two rows tall, I can drag icons to the end. But if I size it down to one row again (it snaps), I lose control over where dropped icons get placed.