@ Michael
go there http://www.teapotters.com/Pilou/media/5FBA435567794B5D
Click play
and click on the icon "Smooth Mode" ( a little white sphere) and see the problem!

I have export it in OBJ "Ngone" !

But I believe it is not the fault of Moi, because when you reload the original in another prog all is fine :)