I'm really tired.  Let me look at it a little more after sleep.

On Wed, Aug 14, 2013 at 5:03 AM, Mathieu Virbel <notifications@github.com>wrote:

> In kivy/uix/screenmanager.py:
>
> > @@ -560,6 +560,52 @@ class FadeTransition(ShaderTransition):
> >      fs = StringProperty(FADE_TRANSITION_FS)
> >
> >
> > +class 2DCardflipTransition(ShaderTransition):
>
> A classname starting with a number is invalid. Miswriting?
> Also, you need to add the class in *all*, and kivy/factory_registers.py
>
> —
> Reply to this email directly or view it on GitHub<https://github.com/kivy/kivy/pull/1441/files#r5759395>
> .
>