Well I was testing Fences and found this bug by accident. If you try to move a fence over the edge of the screen on the top, left, or right sides of the screen the fence and its contents will keep on going. However, if you try to move the fence past the start bar on the bottom of the screen the fence will continue to move but the icons in it get "stuck" on the egde of the screen:
Hope this gets fixed. Otherwise the program is really great!