diff --git a/orchestra/admin/utils.py b/orchestra/admin/utils.py
index cf4ad24e..fede4fe3 100644
--- a/orchestra/admin/utils.py
+++ b/orchestra/admin/utils.py
@@ -36,7 +36,7 @@ def get_modeladmin(model, import_module=True):
 def insertattr(model, name, value):
     """ Inserts attribute to a modeladmin """
     modeladmin = None
-    if isinstance(model, models.Model)
+    if issubclass(model, models.Model):
         modeladmin = get_modeladmin(model)
         modeladmin_class = type(modeladmin)
     elif not inspect.isclass(model):
diff --git a/orchestra/contrib/orchestration/backends.py b/orchestra/contrib/orchestration/backends.py
index d0e9e598..7c74ed4c 100644
--- a/orchestra/contrib/orchestration/backends.py
+++ b/orchestra/contrib/orchestration/backends.py
@@ -99,13 +99,11 @@ class ServiceBackend(plugins.Plugin, metaclass=ServiceMount):
         return None
     
     @classmethod
-    def get_backends(cls, instance=None, action=None, active=None):
+    def get_backends(cls, instance=None, action=None):
         backends = cls.get_plugins()
         included = []
         # Filter for instance or action
         for backend in backends:
-            if active is not None and backend.get_name() not in active:
-                continue
             include = True
             if instance:
                 opts = instance._meta
@@ -205,5 +203,5 @@ class ServiceController(ServiceBackend):
         """ filter controller classes """
         backends = super(ServiceController, cls).get_backends()
         return [
-            backend for backend in backends if isinstance(backend, ServiceController)
+            backend for backend in backends if issubclass(backend, ServiceController)
         ]
diff --git a/orchestra/contrib/orchestration/manager.py b/orchestra/contrib/orchestration/manager.py
index a2a06724..a7cca3bf 100644
--- a/orchestra/contrib/orchestration/manager.py
+++ b/orchestra/contrib/orchestration/manager.py
@@ -1,4 +1,3 @@
-
 import logging
 import threading
 import traceback
@@ -141,8 +140,7 @@ def collect(instance, action, **kwargs):
     """ collect operations """
     operations = kwargs.get('operations', set())
     route_cache = kwargs.get('route_cache', {})
-    active_backends = kwargs.get('active_backends', None)
-    for backend_cls in ServiceBackend.get_backends(active=active_backends):
+    for backend_cls in ServiceBackend.get_backends():
         # Check if there exists a related instance to be executed for this backend and action
         instances = []
         if action in backend_cls.actions:
diff --git a/orchestra/contrib/orchestration/middlewares.py b/orchestra/contrib/orchestration/middlewares.py
index c1ece185..3b1a96d2 100644
--- a/orchestra/contrib/orchestration/middlewares.py
+++ b/orchestra/contrib/orchestration/middlewares.py
@@ -6,16 +6,13 @@ from django.db.models.signals import pre_delete, post_save, m2m_changed
 from django.dispatch import receiver
 from django.http.response import HttpResponseServerError
 
-from orchestra.utils.python import OrderedSet, import_class
+from orchestra.utils.python import OrderedSet
 
-from . import manager, Operation, settings
+from . import manager, Operation
 from .helpers import message_user
 from .models import BackendLog
 
 
-router = import_class(settings.ORCHESTRATION_ROUTER)
-
-
 @receiver(post_save, dispatch_uid='orchestration.post_save_collector')
 def post_save_collector(sender, *args, **kwargs):
     if sender not in [BackendLog, Operation]:
@@ -66,16 +63,6 @@ class OperationsMiddleware(object):
             return request.route_cache
         return {}
     
-    @classmethod
-    def get_active_cache(cls):
-        """ chache the routes to save sql queries """
-        if hasattr(cls.thread_locals, 'request'):
-            request = cls.thread_locals.request
-            if not hasattr(request, 'active_cache'):
-                request.active_cache = router.get_active_backends()
-            return request.active_cache
-        return router.get_active_backends()
-    
     @classmethod
     def collect(cls, action, **kwargs):
         """ Collects all pending operations derived from model signals """
@@ -84,7 +71,6 @@ class OperationsMiddleware(object):
             return
         kwargs['operations'] = cls.get_pending_operations()
         kwargs['route_cache'] = cls.get_route_cache()
-        kwargs['active_backends'] = cls.get_active_cache()
         instance = kwargs.pop('instance')
         manager.collect(instance, action, **kwargs)
     
diff --git a/orchestra/contrib/orchestration/models.py b/orchestra/contrib/orchestration/models.py
index ef731fe0..14012d96 100644
--- a/orchestra/contrib/orchestration/models.py
+++ b/orchestra/contrib/orchestration/models.py
@@ -169,10 +169,6 @@ class Route(models.Model):
                 servers.append(route.host)
         return servers
     
-    @classmethod
-    def get_active_backends(cls):
-        return cls.objects.filter(is_active=True).values_list('backend', flat=True)
-    
     def clean(self):
         if not self.match:
             self.match = 'True'
diff --git a/orchestra/contrib/resources/backends.py b/orchestra/contrib/resources/backends.py
index 37257a19..84d5e1c0 100644
--- a/orchestra/contrib/resources/backends.py
+++ b/orchestra/contrib/resources/backends.py
@@ -21,7 +21,7 @@ class ServiceMonitor(ServiceBackend):
     def get_plugins(cls):
         """ filter controller classes """
         return [
-            plugin for plugin in cls.plugins if isinstance(plugin, ServiceMonitor)
+            plugin for plugin in cls.plugins if issubclass(plugin, ServiceMonitor)
         ]
     
     @classmethod