Here's the bug:
Got a view. Accessible with or without the role "x".
I can see the view in both case. But the content only shows when the role "x" is checked in the ACL. Uncheck the role, and the content won't show.
But security is set to "all readers and above" in the view...
Everything is okay in the Outline (the source is a Named Element, value was correctly selected...)
I also got another view (taking data from another form, but doing a similar kind of thing), and in this case, the view shows its content no matter if the role is checked or not!