I have been dealing with problems regarding 5x5 Flat pieces. I save my map, reselect the map, and the 5x5 pieces move a few inches. I am not using coordinates. How can I get the pieces to not move after I save?
This is a problem when using large objects in forge. When saving some of the decimal places seem to be lost, and thus the alignment becomes slightly off. Here is a recent topic about this (dealing with coliseum walls), the principle is the same, it happens for larger objects, in your case the 5x5, I have seen the same thing in my 4x4's at times. In the above topic you will find a link to a blog post by mrgreen, it will explain what is happening, and how you can solve for it in greater detail.