diff --git a/openlp/core/ui/maindisplay.py b/openlp/core/ui/maindisplay.py
index 5f799d8b1..ea1f95a1d 100644
--- a/openlp/core/ui/maindisplay.py
+++ b/openlp/core/ui/maindisplay.py
@@ -394,7 +394,7 @@ class MainDisplay(Display):
                 # replace the background
                 background = self.image_manager.get_image_bytes(self.override[u'image'], ImageSource.ImagePlugin)
         self.set_transparency(self.serviceItem.themedata.background_type ==
-                              BackgroundType.to_string(BackgroundType.Transparent))
+            BackgroundType.to_string(BackgroundType.Transparent))
         if self.serviceItem.themedata.background_filename:
             self.serviceItem.bg_image_bytes = self.image_manager.get_image_bytes(
                 self.serviceItem.themedata.background_filename, ImageSource.Theme
diff --git a/openlp/core/ui/mainwindow.py b/openlp/core/ui/mainwindow.py
index 96f8efe18..2573179b3 100644
--- a/openlp/core/ui/mainwindow.py
+++ b/openlp/core/ui/mainwindow.py
@@ -536,9 +536,6 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         Registry().register_function(u'openlp_version_check', self.version_notice)
         Registry().register_function(u'config_screen_changed', self.screen_changed)
         self.renderer = Renderer()
-        # Create the displays as all necessary components are loaded.
-        self.preview_controller.screenSizeChanged()
-        self.live_controller.screenSizeChanged()
         log.info(u'Load data from Settings')
         if Settings().value(u'advanced/save current plugin'):
             savedPlugin = Settings().value(u'advanced/current media plugin')
diff --git a/openlp/core/ui/media/mediacontroller.py b/openlp/core/ui/media/mediacontroller.py
index a36bbbeff..8891137b5 100644
--- a/openlp/core/ui/media/mediacontroller.py
+++ b/openlp/core/ui/media/mediacontroller.py
@@ -306,7 +306,7 @@ class MediaController(object):
 
     def setup_display(self, display, preview):
         """
-        After a new display is configured, all media related widget will be
+        After a new display is configured, all media related widgets will be
         created too
 
         ``display``
diff --git a/openlp/core/ui/slidecontroller.py b/openlp/core/ui/slidecontroller.py
index 7fada21fe..a0d750896 100644
--- a/openlp/core/ui/slidecontroller.py
+++ b/openlp/core/ui/slidecontroller.py
@@ -87,6 +87,7 @@ class SlideController(DisplayController):
         Set up the Slide Controller.
         """
         DisplayController.__init__(self, parent, is_live)
+        Registry().register_function(u'bootstrap_post_set_up', self.screenSizeChanged)
         self.screens = ScreenList()
         try:
             self.ratio = float(self.screens.current[u'size'].width()) / float(self.screens.current[u'size'].height())
diff --git a/openlp/core/ui/thememanager.py b/openlp/core/ui/thememanager.py
index 3f14f9921..5943dfa19 100644
--- a/openlp/core/ui/thememanager.py
+++ b/openlp/core/ui/thememanager.py
@@ -280,8 +280,7 @@ class ThemeManager(QtGui.QWidget):
         save_to = None
         save_from = None
         if theme_data.background_type == u'image':
-            save_to = os.path.join(self.path, new_theme_name,
-                os.path.split(unicode(theme_data.background_filename))[1])
+            save_to = os.path.join(self.path, new_theme_name, os.path.split(unicode(theme_data.background_filename))[1])
             save_from = theme_data.background_filename
         theme_data.theme_name = new_theme_name
         theme_data.extend_image_filename(self.path)
@@ -407,7 +406,7 @@ class ThemeManager(QtGui.QWidget):
             theme_file = os.path.join(self.path, theme_file)
             self.unzip_theme(theme_file, self.path)
             delete_file(theme_file)
-        files = AppLocation.get_files(self.settingsSection, u'.otz')
+        files = AppLocation.get_files(self.settingsSection, u'.png')
         # No themes have been found so create one
         if not files:
             theme = ThemeXML()