Did something change in the way you drag/copy objects in 5A854? (downloaded May 30, 2015)
I click on an object (keep mouse down) and press the Command key.
Drag the object (in this case a circle curve) to make a copy.
Instead of dragging a copy it seem to create some a flat, smeared version of the circle.
Maybe I’m mis-remembering, but I recall this working before (like using Alt drag in Windows).