Update to Drupal 8.0.0 beta 14. For more information, see https://drupal.org/node/2544542

core/modules/user/src/Plugin/Block/UserLoginBlock.php

@@ -79,7 +79,7 @@ class UserLoginBlock extends BlockBase implements ContainerFactoryPluginInterfac
     $route_name = $this->routeMatch->getRouteName();
     if ($account->isAnonymous() && !in_array($route_name, array('user.register', 'user.login', 'user.logout'))) {
       return AccessResult::allowed()
-        ->addCacheContexts(['route', 'user.roles:anonymous']);
+        ->addCacheContexts(['route.name', 'user.roles:anonymous']);
     }
     return AccessResult::forbidden();
   }

core/modules/user/src/Plugin/Condition/UserRole.php

@@ -87,4 +87,17 @@ class UserRole extends ConditionPluginBase {
     return (bool) array_intersect($this->configuration['roles'], $user->getRoles());
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheContexts() {
+    // Optimize cache context, if a user cache context is provided, only use
+    // user.roles, since that's the only part this condition cares about.
+    $contexts = [];
+    foreach (parent::getCacheContexts() as $context) {
+      $contexts[] = $context == 'user' ? 'user.roles' : $context;
+    }
+    return $contexts;
+  }
+
 }

core/modules/user/src/Plugin/views/argument/RolesRid.php

@@ -50,7 +50,7 @@ class RolesRid extends ManyToOne {
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
-    return parent::create($container, $configuration, $plugin_id, $plugin_definition, $container->get('entity.manager'));
+    return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity.manager'));
   }
 
   /**