Hello, You are having problems with the nodes of the continuous foundations connected to the P3 and P4 curtains in your model. -One piece of continuous foundation is entered under the curtains. You should enter the continuous foundation piece by piece, taking into account the curtain knot points. -Select model shell element by selecting all curtains. -You also make a phased construction calculation in your model. There may be problems with the nodal points in ideCAD version 7 when the phased construction calculation is made with continuous foundations. We fixed this problem with ideCAD 8. If you are not going to do a phased construction calculation, I suggest you turn this option off as well.