I'm sorry to hear, you're facing these troubles. I‘ve just opened the chapter_9_ducting_end.max with the latest RC 5.2.2 and it seems to work as supposed (the Conditional Operator places the correct Segment upon the vertex type), but might be, I'm overlooking something. If possible, please feel free to send us your scene (ideally simplified and containing just this problematic object(s)) to check it here. Thanks in advance.
Hi, there is no need to send the file... is the same file you have provide for excercise..