Hi PaQ,

> The curves selection order is important in this case (I thought
> Moi is resolving it automatically, but some selection combo
> don't work I don't know why).

This bug is now fixed for the next beta - it was not properly testing every single combination to see if the 4 curves had a curve down the middle like that (and so was not good for Coons patch) but it would get it right in certain orderings.

In the next beta it will test all combinations properly so the ordering will not make any difference for this shape which is what was supposed to happen.

Thanks for reporting the problem!

- Michael