Can't add "Block" display to view in Drupal 7. The default display for my test view works just fine. Then I add a "Page" display that inherits from the default, and that works just fine, and I'm able to view that page version at the path I configured for it. But I can't add a "Block" display for the view. It seems to let me, an I can configure it and save it, but it never works. It won't even preview. Please help! I'm desperate to get this prototype working so that Drupal will be approved for our CMS project. Any assistance will be greatly appreciated.