diff --git a/openlp/core/ui/mainwindow.py b/openlp/core/ui/mainwindow.py
index 09e2ec9e7..167fcdd4a 100644
--- a/openlp/core/ui/mainwindow.py
+++ b/openlp/core/ui/mainwindow.py
@@ -229,6 +229,8 @@ class Ui_MainWindow(object):
         self.ToolsOpenDataFolder = icon_action(mainWindow,
             u'ToolsOpenDataFolder', u':/general/general_open.png',
             category=UiStrings().Tools)
+        self.updateThemeImages = base_action(mainWindow,
+            u'updateThemeImages', category=UiStrings().Tools)
         action_list.add_category(UiStrings().Settings, CategoryOrder.standardMenu)
         self.settingsPluginListItem = shortcut_action(mainWindow,
             u'settingsPluginListItem', [QtGui.QKeySequence(u'Alt+F7')],
@@ -292,6 +294,7 @@ class Ui_MainWindow(object):
             self.SettingsConfigureItem))
         add_actions(self.ToolsMenu, (self.ToolsAddToolItem, None))
         add_actions(self.ToolsMenu, (self.ToolsOpenDataFolder, None))
+        add_actions(self.ToolsMenu, [self.updateThemeImages])
         add_actions(self.HelpMenu, (self.HelpDocumentationItem,
             self.HelpOnlineHelpItem, None, self.helpWebSiteItem,
             self.HelpAboutItem))
@@ -433,6 +436,11 @@ class Ui_MainWindow(object):
             translate('OpenLP.MainWindow', 'Open &Data Folder...'))
         self.ToolsOpenDataFolder.setStatusTip(translate('OpenLP.MainWindow',
             'Open the folder where songs, bibles and other data resides.'))
+        self.updateThemeImages.setText(
+            translate('OpenLP.MainWindow', 'Update Theme Images'))
+        self.updateThemeImages.setStatusTip(
+            translate('OpenLP.MainWindow', 'Update the preview images for all '
+                'themes.'))
         self.ModeDefaultItem.setText(
             translate('OpenLP.MainWindow', '&Default'))
         self.ModeDefaultItem.setStatusTip(translate('OpenLP.MainWindow',
@@ -505,6 +513,8 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
             QtCore.SIGNAL(u'triggered()'), self.onHelpOnLineHelpClicked)
         QtCore.QObject.connect(self.ToolsOpenDataFolder,
             QtCore.SIGNAL(u'triggered()'), self.onToolsOpenDataFolderClicked)
+        QtCore.QObject.connect(self.updateThemeImages,
+            QtCore.SIGNAL(u'triggered()'), self.onUpdateThemeImages)
         QtCore.QObject.connect(self.DisplayTagItem,
             QtCore.SIGNAL(u'triggered()'), self.onDisplayTagItemClicked)
         QtCore.QObject.connect(self.SettingsConfigureItem,
@@ -717,6 +727,12 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         path = AppLocation.get_data_path()
         QtGui.QDesktopServices.openUrl(QtCore.QUrl("file:///" + path))
 
+    def onUpdateThemeImages(self):
+        """
+        Updates the new theme preview images.
+        """
+        self.themeManagerContents.updatePreviewImages()
+
     def onDisplayTagItemClicked(self):
         """
         Show the Settings dialog
@@ -778,16 +794,18 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
 
     def screenChanged(self):
         """
-        The screen has changed to so tell the displays to update_display
-        their locations
+        The screen has changed so we have to update components such as the
+        renderer.
         """
         log.debug(u'screenChanged')
+        Receiver.send_message(u'cursor_busy')
         self.image_manager.update_display()
         self.renderer.update_display()
-        self.liveController.screenSizeChanged()
         self.previewController.screenSizeChanged()
+        self.liveController.screenSizeChanged()
         self.setFocus()
         self.activateWindow()
+        Receiver.send_message(u'cursor_normal')
 
     def closeEvent(self, event):
         """
diff --git a/openlp/core/ui/thememanager.py b/openlp/core/ui/thememanager.py
index e30c9dea3..190939ab9 100644
--- a/openlp/core/ui/thememanager.py
+++ b/openlp/core/ui/thememanager.py
@@ -660,6 +660,18 @@ class ThemeManager(QtGui.QWidget):
         pixmap.save(thumb, u'png')
         log.debug(u'Theme image written to %s', samplepathname)
 
+    def updatePreviewImages(self):
+        """
+        Called to update the themes' preview images.
+        """
+        self.mainwindow.displayProgressBar(len(self.themelist))
+        for theme in self.themelist:
+            self.mainwindow.incrementProgressBar()
+            self.generateAndSaveImage(
+                self.path, theme, self.getThemeData(theme))
+        self.mainwindow.finishedProgressBar()
+        self.loadThemes()
+
     def generateImage(self, themeData, forcePage=False):
         """
         Call the renderer to build a Sample Image
diff --git a/openlp/core/utils/__init__.py b/openlp/core/utils/__init__.py
index 3051301d6..c5c08fad4 100644
--- a/openlp/core/utils/__init__.py
+++ b/openlp/core/utils/__init__.py
@@ -342,7 +342,7 @@ def add_actions(target, actions):
         The menu or toolbar to add actions to.
 
     ``actions``
-        The actions to be added. An action consisting of the keyword 'None'
+        The actions to be added. An action consisting of the keyword ``None``
         will result in a separator being inserted into the target.
     """
     for action in actions: