Hi Yanik,

re:
> If I offset just 1 polyline I get the same issues. So it's not related to complexity. Try the dxf and you'll see.

I am seeing some issues with polylines that are at shallow angles to one another.

In general MoI is not expecting to work with polylines like that which have numerous line segments at shallow angles to one another, it's expecting for things shaped like that to be smooth curves and not polylines.

- Michael