Hi Jack, thanks for your comments.
Re. 9. This problem is now solved. I was referring to an internal wall on the 2nd floor (height 400mm) that is set to extend automatically. When a door is inserted, it's easy as a door always starts at the floor level, when an "opening" is inserted however, I had to start with a smaller opening and thereafter change elevation and height to get it in the correct position.
Re 10. The problem that I was referring to happens only when you're trying to insert a window with a HIHGLITE in an outside wall. The standard elevation of the window seem to be calculated based on the window WITHOUT the highlite.
Re 11. I've tried to change all parameters, but without success. My stairs are 3400mm floor-to-floor, 17 steps, height/run is 200mm/200mm and the width of all stairs is 1000mm. The attached image shows the parameters for stair 2. What would you suggest to change here?
By the way, I have no problem inserting "U-Shape-Rright" stairs with the same dimensions.
Sebastian