[ WP.3.0 RC2 ] Problem creating a custom role for a custom post type

Hi all,
I’m stuck in a problem, and this is it:

– I’ve created a custom post type, ‘aziende’, with the capability_type ‘azienda’ .

– I’ve also created a new user role called ‘Azienda’, and I want it to work exactly like default role ‘Author’ works for default type ‘post’ ( ‘Somebody who can publish and manage their own posts’ )

Using the nice ‘Members’ plugin written by Justin Tadlock to manage capabilities, I’ve added the following capabilities

edit_aziendas
delete_aziendas
delete_published_aziendas
edit_published_aziendas
publish_aziendas

Then I checked the following capabilities for ‘Aziende’ role

edit_aziendas
delete_aziendas
delete_published_aziendas
edit_published_aziendas
publish_aziendas
upload_files
read

That are the same capabilities that author role has for post type.

Now the problem: using an ‘Azienda’ role user, I am not allowed to edit and publish azienda post type, note that I can see the ‘publish’ button in the ‘add new azienda’ form.

Does anybody have a clue?

Thank you!