I am on Rhino 6 SR30.
This is a bit random and I can’t repro following the same steps every time. I extrude some curves, then intersect the resulting surfaces with some planes, sometimes whats happening in the image occurs. Some surfaces just don’t get intersected with just “intersection failed” message.
And then other times Rhino and grasshopper just crash without even showing the crash window for sending a report.
i internalized some of the data from the file I was working on.
All I can say for a repro is try multiple times disconnecting and connecting the wire from “Extruded result” to follow the red sketched arrows.
bug.gh (34.8 KB)