Try editing the sketch of the section line, then control selecting all lines that make up the section line, and hit the exit sketch button at the top right (or rebuild).
If I understand correctly your section line used to be a single straight line, now it is comprised of more than one line, with the mulitple lines at angles to each other.
My suggestion works for me, hopefully it does for you also.
Yes, that is what I meant. I made the change but it would not accept the entire new change. I have been a bit out of the loop lately and just getting back on track. I cannot recall what I did on that drawing now, but it might have been the order I created the new lines - or picked them. Anyway< I think I got it to work.