Thanks for helping out, Yes, it works as you describe if I start from scratch with a new file. Something must have gotten wrong with the rather complicated tutorial session. Meanwhile I resolved the problem setting up two points in Rhino and then pushing them into approximatively the right positions with Gumball. As when working with CAD (Microstation in my case) there are several ways to solve a problem, although not always with 100% engineering accuracy. Greetings, Ingemar

Hi Ingemar! My apologies, I missed your question. You mean @4:13 where Judyta selects the two reference points? If you're having problems selecting those points, make sure you do one of the following things: 1) Make sure everything is deselected in Rhino. Right click on the point component and select "Set Multiple Points". Select the two points. OR: 2) Select the two points in Rhino. Go to Grasshopper and right click on the point component and select "Set Multiple Points". If you by accident click on "Set one Point", you don't see the fencing in window, you can only select one point, maybe this was the problem? Let me know if this worked for you and good luck! Cheers, Arie