diff --git a/openlp/core/__init__.py b/openlp/core/__init__.py
index d25e7a284..3ad0e1348 100644
--- a/openlp/core/__init__.py
+++ b/openlp/core/__init__.py
@@ -150,7 +150,7 @@ class OpenLP(QtGui.QApplication):
         update_check = Settings().value(u'general/update check')
         if update_check:
             VersionThread(self.main_window).start()
-        self.main_window.blank_check()
+        self.main_window.is_display_blank()
         self.main_window.app_startup()
         return self.exec_()
 
diff --git a/openlp/core/lib/registry.py b/openlp/core/lib/registry.py
index 3e889890d..bbc99d4d0 100644
--- a/openlp/core/lib/registry.py
+++ b/openlp/core/lib/registry.py
@@ -60,10 +60,10 @@ class Registry(object):
         registry = cls()
         registry.service_list = {}
         registry.functions_list = {}
-        registry.running_under_test = True
+        registry.running_under_test = False
         # Allow the tests to remove Registry entries but not the live system
-        if u'openlp.py' in sys.argv[0]:
-            registry.running_under_test = False
+        if u'nose' in sys.argv[0]:
+            registry.running_under_test = True
         return registry
 
     def get(self, key):
@@ -106,13 +106,12 @@ class Registry(object):
         if self.running_under_test is False:
             log.error(u'Invalid Method call for key %s' % key)
             raise KeyError(u'Invalid Method call for key %s' % key)
-            return
         if key in self.service_list:
             del self.service_list[key]
 
     def register_function(self, event, function):
         """
-        Register a function and a handler to be called later
+        Register an event and associated function to be called
 
         ``event``
             The function description like "config_updated" or "live_display_hide" where a number of places in the
@@ -122,14 +121,14 @@ class Registry(object):
         ``function``
             The function to be called when the event happens.
         """
-        if not self.functions_list.has_key(event):
-            self.functions_list[event] = [function]
-        else:
+        if event in self.functions_list:
             self.functions_list[event].append(function)
+        else:
+            self.functions_list[event] = [function]
 
     def remove_function(self, event, function):
         """
-        Register a function and a handler to be called later
+        Remove an event and associated handler
 
         ``event``
             The function description..
@@ -140,13 +139,12 @@ class Registry(object):
         if self.running_under_test is False:
             log.error(u'Invalid Method call for key %s' % event)
             raise KeyError(u'Invalid Method call for key %s' % event)
-            return
         if event in self.functions_list:
             self.functions_list[event].remove(function)
 
     def execute(self, event, *args, **kwargs):
         """
-        Execute all the handlers registered passing the data to the handler and returning results
+        Execute all the handlers associated with the event and return an array of results.
 
         ``event``
             The function to be processed
@@ -170,4 +168,3 @@ class Registry(object):
                     log.debug(inspect.currentframe().f_back.f_locals)
                     log.exception(u'Exception for function %s', function)
         return results
-
diff --git a/openlp/core/lib/screen.py b/openlp/core/lib/screen.py
index 65ccd9f2f..913ad539c 100644
--- a/openlp/core/lib/screen.py
+++ b/openlp/core/lib/screen.py
@@ -244,7 +244,7 @@ class ScreenList(object):
         Loads the screen size and the monitor number from the settings.
         """
         from openlp.core.lib import Settings
-        # Add the screen settings to the settings dict. This has to be done here due to crycle dependency.
+        # Add the screen settings to the settings dict. This has to be done here due to cyclic dependency.
         # Do not do this anywhere else.
         screen_settings = {
             u'general/x position': self.current[u'size'].x(),
diff --git a/openlp/core/lib/settings.py b/openlp/core/lib/settings.py
index 7e72c6d4c..56821f1d1 100644
--- a/openlp/core/lib/settings.py
+++ b/openlp/core/lib/settings.py
@@ -259,6 +259,7 @@ class Settings(QtCore.QSettings):
         """
         Settings.__default_settings__ = dict(default_values.items() + Settings.__default_settings__.items())
 
+
     @staticmethod
     def set_filename(ini_file):
         """
diff --git a/openlp/core/ui/mainwindow.py b/openlp/core/ui/mainwindow.py
index 902078ecc..e86f068a8 100644
--- a/openlp/core/ui/mainwindow.py
+++ b/openlp/core/ui/mainwindow.py
@@ -695,7 +695,7 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         Registry().execute(u'bibles_load_list', True)
         self.application.set_normal_cursor()
 
-    def blank_check(self):
+    def is_display_blank(self):
         """
         Check and display message if screen blank on setup.
         """