Hi Pilou,

> But there is always trouble when I pass over the
> "ghost forms" of the original object position when
> I slide the object on the curve!!!
> How avoid that?

You could move the original object off to the side somewhere so it wasn't directly on top of the area that you wanted to orient it on.

Or another possibility is to assign a name to your object and then while you are within the orient command you can go to the Scene browser Objects section and hide it and the wireframe outline of it will then be hidden.

- Michael