I’ve noticed that since I installed the latest release a couple of days ago I can’t seem to trim curves unless they are on the same plane?
So as an example, if I have to lines crossing and I move one 5mm up in the Z direction I can’t trim when viewing the crossing lines in in plan view. It’s an odd one as Rhino trims pretty much anything anywhere.
In Rhino windows there is an option for apparent intersections. If on it will trim even if they don’t intersect. If off it will only trim they actually intersect each other. Do you have that option off?
Edit:
Just checked that option is there on the mac. So I would make sure apparent intersections is check on.