I used this for around a year to hide the admin nav bar
function remove_read_wpse_93843(){
$role = get_role( 'subscriber' );
$role->remove_cap( 'read' );
}
add_action( 'admin_init', 'remove_read_wpse_93843' );
All of a sudden doesn't work anymore - every kind of user sees the admin nav.
How should I change the code?