I've ran into problems with duplicating a container. I was placing a container and then using Ctrl + D to duplicate it and dragging it where I wanted to place it. I wouldn't do that, not sure why or if my problem was due to that placement-method but since then I've made sure to place each container via the Object Window. My theory is that when you drag a container from the object window it gives the container a unique memory address, duplicating the container duplicates the memory address? Just a theory.
