This is my first post here. I raised this issue on Sketucation, and the consensus was that this is a bug that has been around a while. I’m using SU Make 2015. The issue is that when a section plane is applied to or in a component and that component is flipped along an axis that should not change the cutting direction (as indicated by the arrows when in context), the cutting direction is nevertheless reversed. The same goes for groups, but obviously with groups you can correct that behaviour. I had hoped to use section cuts to make non destructive edits to components so that the same edit could be applied to a swapped component. This issue makes the approach less viable.
In my example, I was creating a 110 degree mitre joint on two copies of a component which is a profiled piece of timber to make a roof verge on either side of a shed. The containing component was the entire side of the shed, including the frame and the outer covering. The two sides are symmetrical and one is flipped. I wanted to keep them in synch. On a small scale it’s not too much of a hardship maintaining two groups to be virtually identical, but in a more complicated model this could get out of hand. Many thanks.