if I set my $blocks array like this:

  case 'list':
   $blocks[0] = array('info' => 'name');
   $blocks[1] = array('info' => 'name');
   $blocks[2] = array('info' => 'name');

only the first one appears on Blocks config page

I just changed to this:

   $blocks[] = array('info' => 'name');
   $blocks[] = array('info' => 'name');
   $blocks[] = array('info' => 'name');

And worked!! All three shows up

I tested with this example, same problem:

Feijó