You can see the reference wall/bench on the left that I modeled previously, but now I need a new version where they wrap around a circle with outer walls sloping so they meet at the tops; wall heights increase gradually, but I still need the front of the wall to smoothly transition into the front lip of the bench.
That seems fine here. What happens when you import the file instead of opening it?
Seeing that your last crash report in our system is from October 2025, I take it there is no crash reporter when Rhino crashes?
-wim