user logged gets an empty view

I have a view to show a list of books a user had read. There are two different types of node: node_book and node_book_read with a user reference field and a node reference field to book title.
The type book_read is view protected with CA to a specific role
The view gets the user id as argument and lists the books that user had read.
When the current user pass its user id as argument he gets an empty view, but if he pass another user id he can see the books that user had read: a can see the list of any user but himself.
I use CA 6.x-1.x-dev and Views 6.x-2.12