In a drawing that I have edited many times, I noted a strange (for me) behaviour. When I open the design any selection of an entity (2D or 3D) and a drag of it, just moves it to the new location. After I insert some new entities (notably rectangles) the default behaviour changes: any entity drag doe...

I tried the command on any simple shape, as a box, a cone, or extruded rectangle, but it seem to never succeed. I'm using vers. 5.1.5.0, and all I get, after I selected an entity, and flatten it to zero is something like this: ---------------------------- : _FLATTEN New UCS elevation <0.0000>: 0 1 e...