Hi Rudy, here I've attached an updated version that has the pieces tuned up so they're smooth to one another. I did that by turning on control points and collapsing the endpoints and first inside points of each curve to be in a straight line. Now that they are smooth to each other rather than at a very slight sharp corner it should behave properly in both v2 and v3.
I'm not entirely sure why v3 did not like your file as much as v2 did - I do seem to remember some changes in v3 to miter intersections to use an intersection tolerance relative to the size of the individual curve segment rather than the whole big curve. That then fixed other cases that were not intersecting properly but seems to have made this grazing tangent intersection case you have here behave not quite as good. The "near tangent" type intersections are a problematic area in general though, it's usually best to set up your geometry in such a way that they're just avoided.
- Michael
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