Hi,
To avoid deformations on "pole" Segments, please disable the Deform - Bend option for this Segment and switch to the Stepped mode to align them vertically. Under the Linear 1S generator Rules - Corner, the Bevel Corner option should be enabled. Attaching the modified scene. Hope you'll find it useful.
Let me add, that we're just analysing the unhandled exception leading to 3ds max crash.
Best regadrs,