I found a Sweep2 error (bug maybe) in my Rhino course when I followed teacher’s steps with my mac.
The problem was that sweep2 could not make a surface to blend 2 mirror surfaces with keeping G2,even i chose G2 both in the rail curve option.
I am sured I have built correct cross line. Because sweep2 created a perfect, symmetrical surface when I opened the same file in rhino 5 for windows.
you can compare the surface in Layer 2.
the version of my rhino for mac OS is 2014-4-21(510)
forgive my poor english- -
Sweep2 Problem.3dm (2.0 MB)