I'm having problems with the 3D sketching with planes tutorial. I got to the last part where the loft is created. But when I get to the point where I have to click in Guide Curves and select the Open Loop in Selectionmanager in order to pick the three splines for Guide Curves it only lets me select one spline. In other words once I click the first spline (it does not matter which one) the other two splines become inactive the program won't let me select them. Can anyone give me some feedback on what might be happening? Thank you.