I have tried to reproduce the problem on a file that I think I had to force quit out of a few days ago but the Intersect command now works, so I can’t test if Esc aborts. I am wondering if the problem with Intersect is due to memory exhaustion, i.e. if I have been using Rhino for several hours the Intersect command just takes a very long time to complete fooling me into thinking that the operation has stalled. Could this be the case? Either way, Esc has not got me out of a slow operation. I will have to wait until the issue next presents itself, then re-contact you.
While endeavouring to reproduce the problem, however, I came across another. In the file that I have uploaded, I attempted a Boolean Split of the Coupling using Cutplane. This operation failed even though Intersect generated 3 closed intersections that should have split the part. Might you be able to tell me why the Boolean Split failed?
Mdownpipe diverter.3dm (4.3 MB)