diff --git a/airflow/bin/cli.py b/airflow/bin/cli.py
index 897df0dd31..4b628b35d7 100755
--- a/airflow/bin/cli.py
+++ b/airflow/bin/cli.py
@@ -250,7 +250,10 @@ def serve_logs(args):
 
 def worker(args):
     # Worker to serve static log files through this simple flask app
-    sp = subprocess.Popen(['airflow', 'serve_logs'])
+    sp = subprocess.Popen(
+        ['airflow', 'serve_logs'],
+        env={'AIRFLOW_HOME': settings.AIRFLOW_HOME}
+    )
 
     # Celery worker
     from airflow.executors.celery_executor import app as celery_app
diff --git a/airflow/configuration.py b/airflow/configuration.py
index cb03794db3..a5de703508 100644
--- a/airflow/configuration.py
+++ b/airflow/configuration.py
@@ -11,6 +11,7 @@ defaults = {
         'base_url': 'http://localhost:8080',
         'web_server_host': '0.0.0.0',
         'web_server_port': '8080',
+        'authenticate': False,
     },
     'scheduler': {
         'statsd_on': False,
diff --git a/airflow/default_login.py b/airflow/default_login.py
index 2febaf9b2c..b1cd105562 100644
--- a/airflow/default_login.py
+++ b/airflow/default_login.py
@@ -63,7 +63,6 @@ def login(self, request):
     if not user:
         user = models.User(
             username=DEFAULT_USERNAME,
-            has_access=True,
             is_superuser=True)
     session.merge(user)
     session.expunge_all()
diff --git a/airflow/models.py b/airflow/models.py
index b7cdf5a40e..01b6d26c55 100644
--- a/airflow/models.py
+++ b/airflow/models.py
@@ -934,12 +934,12 @@ class BaseOperator(Base):
             '_sa_instance_state', '_upstream_list', '_downstream_list', 'dag'}
         for k in set(self.__dict__) - blacklist:
             if self.__dict__[k] != other.__dict__[k]:
-                logging.debug(str(
+                logging.debug(str((
                     self.dag_id,
                     self.task_id,
                     k,
                     self.__dict__[k],
-                    other.__dict__[k]))
+                    other.__dict__[k])))
                 return -1
         return 0
 
@@ -1426,6 +1426,7 @@ class DAG(Base):
         # backdoor
         cls = self.__class__
         result = cls.__new__(cls)
+        setattr(result, '_sa_instance_state', getattr(self, '_sa_instance_state'))
         memo[id(self)] = result
         for k, v in self.__dict__.items():
             if k not in ('user_defined_macros', 'params'):