Once Upon a Reference Plane
Is you Is or Is You Ain't
I've neglected to mention this change: In the past using the Weak reference setting would not generate drag arrows. They've changed this at some point, which I haven't pinned down (2010ish) but I think it had to do with the changes to the massing conceptual design environment.
The Video that appears below demonstrates some subtlety between the Weak and Strong reference settings. The nice names like Front, Back, Top and Bottom are all Strong references by the way. When you combine Weak references with a dimension assigned to a Instance parameter you get "move" behavior when you use the Align tool. When you do the same for Strong references you get "stretch" behavior. If you want your family to move, think Weak. Think Strong for Stretch.
