Hi andras, actualy this problem is somewhat different, it's a failure of the automatic un-twisting mechanism.
There is a process that MoI does in some operations like Loft to line up the "seam point" of a closed curve when combining them together into a surface to try and avoid making a twisted result.
In this case it is not working properly, and the surface that it is trying to generate is all twisted and messed up.
You can fix it though by adjusting the seam point by dragging on the little grips that show up in the viewport at the "Loft options" prompt before you exit the Loft command. When you get them aligned well, the surface will then pop in like this:
I'll put this on my list to look at in the future, it would be good if the automatic untwisting optimizer would handle this better, but it most likely has something to do with the very long and skinny shape. And actually a kind of tolerance is likely to be involved as well - there is a part of the untwister that decides if the "natural" seam orientation is close enough to the optimized one, it will use the natural one instead. It looks like that is getting triggered here and the natural seam of each circle in this case are rotated by 180 degrees from one another.
So another workaround to fix it is to rotate one of the circles by 180 degrees which you can do using the rotation grip on the edit frame.
- Michael
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