Could you please enlighten me on what to do when getting "ARX error:eDUPLICATEeKEY" message everytime I insert blocks or copy paste object from another file. I do some editing using Autocad 2007 and save the drawings in lower Autocad version. Everytime I use Autocad 2006 or lower version to edit any drawings that I previously did in 2007, I'm getting that ARX message error and the drawing freezes. Thanks.