Here are the Before and After Photo's of the Problem. The Tool is the Offset Edge Loop Tool. The problem happens when selecting the Edges and using OELT. When you select the edges the other edges deselect or add more edges and when you hit command Z to undo all the edges go unselected. I'm learning a lot from you Jerry can Video and I doing these Lessons so that I can use Maya for my 3D work. I was using Sketch Up and importing the finished models into Maya but we had problems with rendering with the shadows, this also cause other problems with lighting. I think that the problems were with the models from SketchUp. I was thinking about using Ninja City as a Pluggin to produce city scenes and what to know your input on the Ninja City Pluggin. Thanks