hello. in the online user guide it says:
To align a corner segment to the path
Open the Style Editor
Select the L1S Generator you wish to apply this rule to.
Go to Properties>Rules>Corner and turn on Align to Path.
Alternatively, turn this property off to align the corner with the preceding segment.
And shows a picture of a brick wall with a corner pillar that's rotated 45 degrees and one that is not rotated.
I have tried this option checked and un-checked but i get the same result, the corner pillar is sliced at an angle. See attached screen shot. ps - i'm brand-new to railclone.