New Post: EDMX designer can't see my EF6 provider

Hi Alberto (I think I know you :) ),
you can have a look here.
http://entityframework.codeplex.com/discussions/573409
I solved it some months ago (with the hints I posted) but actually I can't make it work again :(
Probably I changed something in my registration (not in source code, I'm sure about it).

If you solve it please post it here...
Umberto