Solid from planar curves R v4

what happens in Rhino v4 ?
Left, solid => extrude planar curve,
Object has artifacts and poor geometry for editing.
Is this problem known ?

Best regards

Sounds like crease splitting accidentally got turned off… It happens.

Type CreaseSplitting and set SplitAlongCreases to Yes.

To fix exising objects, use DivideAlongCreases.

HTH, --Mitch

I had changed this settings some time ago…and forget it…
That’s it…
Many thanks Mitch