I am having an issue with Draftsight Pro. When I open an dwg made in Autocad or in Draftsight, I can not edit it. Even creating a new blank file in Draftsight, draw something like a line, save the file, close it and reopen it, it doesn't let me edit the drawing. What could be the issue? I'm using Draftsight 2018 R1 and even deleted and re-installed Draftsight and registered.