diff --git a/openlp/core/lib/pluginmanager.py b/openlp/core/lib/pluginmanager.py
index 8899f5846..b90375506 100644
--- a/openlp/core/lib/pluginmanager.py
+++ b/openlp/core/lib/pluginmanager.py
@@ -85,6 +85,14 @@ class PluginManager(object):
         log.debug(u'finding plugins in %s at depth %d',
             unicode(plugin_dir), startdepth)
         for root, dirs, files in os.walk(plugin_dir):
+            # TODO Presentation plugin is not yet working on Mac OS X.
+            # For now just ignore it. The following code will hide it
+            # in settings dialog.
+            if sys.platform == 'darwin':
+                present_plugin_dir = os.path.join(plugin_dir, 'presentations')
+                # Ignore files from the presentation plugin directory.
+                if root.startswith(present_plugin_dir):
+                    continue
             for name in files:
                 if name.endswith(u'.py') and not name.startswith(u'__'):
                     path = os.path.abspath(os.path.join(root, name))
diff --git a/openlp/core/ui/firsttimewizard.py b/openlp/core/ui/firsttimewizard.py
index 1ce523cbc..4477dd4cb 100644
--- a/openlp/core/ui/firsttimewizard.py
+++ b/openlp/core/ui/firsttimewizard.py
@@ -82,13 +82,13 @@ class Ui_FirstTimeWizard(object):
         self.imageCheckBox.setChecked(True)
         self.imageCheckBox.setObjectName(u'imageCheckBox')
         self.pluginLayout.addWidget(self.imageCheckBox)
-        self.presentationCheckBox = QtGui.QCheckBox(self.pluginPage)
-        if sys.platform == "darwin":
-            self.presentationCheckBox.setChecked(False)
-        else:
+        # TODO Presentation plugin is not yet working on Mac OS X.
+        # For now just ignore it.
+        if sys.platform != 'darwin':
+            self.presentationCheckBox = QtGui.QCheckBox(self.pluginPage)
             self.presentationCheckBox.setChecked(True)
-        self.presentationCheckBox.setObjectName(u'presentationCheckBox')
-        self.pluginLayout.addWidget(self.presentationCheckBox)
+            self.presentationCheckBox.setObjectName(u'presentationCheckBox')
+            self.pluginLayout.addWidget(self.presentationCheckBox)
         self.mediaCheckBox = QtGui.QCheckBox(self.pluginPage)
         self.mediaCheckBox.setChecked(True)
         self.mediaCheckBox.setObjectName(u'mediaCheckBox')
@@ -214,10 +214,11 @@ class Ui_FirstTimeWizard(object):
         self.bibleCheckBox.setText(translate('OpenLP.FirstTimeWizard', 'Bible'))
         self.imageCheckBox.setText(translate('OpenLP.FirstTimeWizard',
             'Images'))
-        self.presentationCheckBox.setText(translate('OpenLP.FirstTimeWizard',
-            'Presentations'))
-        if sys.platform == "darwin":
-            self.presentationCheckBox.setEnabled(False)
+        # TODO Presentation plugin is not yet working on Mac OS X.
+        # For now just ignore it.
+        if sys.platform != 'darwin':
+            self.presentationCheckBox.setText(translate('OpenLP.FirstTimeWizard',
+                'Presentations'))
         self.mediaCheckBox.setText(translate('OpenLP.FirstTimeWizard',
             'Media (Audio and Video)'))
         self.remoteCheckBox.setText(translate('OpenLP.FirstTimeWizard',
diff --git a/openlp/core/ui/thememanager.py b/openlp/core/ui/thememanager.py
index a5293e3a8..70bf78b29 100644
--- a/openlp/core/ui/thememanager.py
+++ b/openlp/core/ui/thememanager.py
@@ -284,6 +284,7 @@ class ThemeManager(QtGui.QWidget):
                             plugin.renameTheme(old_theme_name, new_theme_name)
                     self.mainwindow.renderer.update_theme(
                         new_theme_name, old_theme_name)
+                    self.loadThemes()
 
     def onCopyTheme(self):
         """
diff --git a/openlp/core/utils/__init__.py b/openlp/core/utils/__init__.py
index 764cab06a..742b1e4bc 100644
--- a/openlp/core/utils/__init__.py
+++ b/openlp/core/utils/__init__.py
@@ -498,8 +498,13 @@ def locale_compare(string1, string2):
     """
     # Function locale.strcol() from standard Python library does not work
     # properly on Windows and probably somewhere else.
-    return int(QtCore.QString.localeAwareCompare(
-        QtCore.QString(string1).toLower(), QtCore.QString(string2).toLower()))
+    return QtCore.QString.localeAwareCompare(string1.lower(), string2.lower())
+
+
+# For performance reasons provide direct reference to compare function
+# without wrapping it in another function making te string lowercase.
+# This is needed for sorting songs.
+locale_direct_compare = QtCore.QString.localeAwareCompare
 
 
 from languagemanager import LanguageManager
@@ -508,4 +513,5 @@ from actions import ActionList
 __all__ = [u'AppLocation', u'get_application_version', u'check_latest_version',
     u'add_actions', u'get_filesystem_encoding', u'LanguageManager',
     u'ActionList', u'get_web_page', u'get_uno_command', u'get_uno_instance',
-    u'delete_file', u'clean_filename', u'format_time', u'locale_compare']
+    u'delete_file', u'clean_filename', u'format_time', u'locale_compare',
+    u'locale_direct_compare']
diff --git a/openlp/plugins/presentations/lib/impresscontroller.py b/openlp/plugins/presentations/lib/impresscontroller.py
index a85f43592..3d78f7bdb 100644
--- a/openlp/plugins/presentations/lib/impresscontroller.py
+++ b/openlp/plugins/presentations/lib/impresscontroller.py
@@ -153,7 +153,7 @@ class ImpressController(PresentationController):
         desktop = None
         try:
             desktop = self.manager.createInstance(u'com.sun.star.frame.Desktop')
-        except AttributeError:
+        except (AttributeError, pywintypes.com_error):
             log.warn(u'Failure to find desktop - Impress may have closed')
         return desktop if desktop else None
 
@@ -284,6 +284,8 @@ class ImpressDocument(PresentationDocument):
         props = tuple(props)
         doc = self.document
         pages = doc.getDrawPages()
+        if not pages:
+            return
         if not os.path.isdir(self.get_temp_folder()):
             os.makedirs(self.get_temp_folder())
         for idx in range(pages.getCount()):
@@ -359,7 +361,7 @@ class ImpressDocument(PresentationDocument):
         log.debug(u'is active OpenOffice')
         if not self.is_loaded():
             return False
-        return self.control is not None
+        return self.control.isRunning() if self.control else False
 
     def unblank_screen(self):
         """
@@ -380,7 +382,7 @@ class ImpressDocument(PresentationDocument):
         Returns true if screen is blank
         """
         log.debug(u'is blank OpenOffice')
-        if self.control:
+        if self.control and self.control.isRunning():
             return self.control.isPaused()
         else:
             return False
@@ -436,7 +438,11 @@ class ImpressDocument(PresentationDocument):
         """
         Triggers the next effect of slide on the running presentation
         """
+        is_paused = self.control.isPaused()
         self.control.gotoNextEffect()
+        time.sleep(0.1)
+        if not is_paused and self.control.isPaused():
+            self.control.gotoPreviousEffect()
 
     def previous_step(self):
         """
diff --git a/openlp/plugins/presentations/lib/messagelistener.py b/openlp/plugins/presentations/lib/messagelistener.py
index cb8f7b7b8..7cc12c7f9 100644
--- a/openlp/plugins/presentations/lib/messagelistener.py
+++ b/openlp/plugins/presentations/lib/messagelistener.py
@@ -49,6 +49,7 @@ class Controller(object):
         """
         self.is_live = live
         self.doc = None
+        self.hide_mode = None
         log.info(u'%s controller loaded' % live)
 
     def add_handler(self, controller, file, hide_mode, slide_no):
@@ -67,6 +68,7 @@ class Controller(object):
             # Inform slidecontroller that the action failed?
             return
         self.doc.slidenumber = slide_no
+        self.hide_mode = hide_mode
         if self.is_live:
             if hide_mode == HideMode.Screen:
                 Receiver.send_message(u'live_display_hide', HideMode.Screen)
@@ -78,7 +80,7 @@ class Controller(object):
             else:
                 self.doc.start_presentation()
                 Receiver.send_message(u'live_display_hide', HideMode.Screen)
-                self.doc.slidenumber = 0
+                self.doc.slidenumber = 1
                 if slide_no > 1:
                     self.slide(slide_no)
 
@@ -88,100 +90,134 @@ class Controller(object):
         Use the last slide number.
         """
         log.debug(u'Live = %s, activate' % self.is_live)
+        if not self.doc:
+            return False
         if self.doc.is_active():
-            return
+            return True
         if not self.doc.is_loaded():
             if not self.doc.load_presentation():
-                return
+                log.warn(u'Failed to activate %s' % self.doc.filepath)
+                return False
         if self.is_live:
             self.doc.start_presentation()
             if self.doc.slidenumber > 1:
                 if self.doc.slidenumber > self.doc.get_slide_count():
                     self.doc.slidenumber = self.doc.get_slide_count()
                 self.doc.goto_slide(self.doc.slidenumber)
+        if self.doc.is_active():
+            return True
+        else:
+            log.warn(u'Failed to activate %s' % self.doc.filepath)
+            return False
 
     def slide(self, slide):
         """
         Go to a specific slide
         """
         log.debug(u'Live = %s, slide' % self.is_live)
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        if self.doc.is_blank():
+        if self.hide_mode:
             self.doc.slidenumber = int(slide) + 1
+            self.poll()
+            return
+        if not self.activate():
             return
-        self.activate()
         self.doc.goto_slide(int(slide) + 1)
-        self.doc.poll_slidenumber(self.is_live)
+        self.poll()
 
     def first(self):
         """
         Based on the handler passed at startup triggers the first slide
         """
         log.debug(u'Live = %s, first' % self.is_live)
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        if self.doc.is_blank():
+        if self.hide_mode:
             self.doc.slidenumber = 1
+            self.poll()
+            return
+        if not self.activate():
             return
-        self.activate()
         self.doc.start_presentation()
-        self.doc.poll_slidenumber(self.is_live)
+        self.poll()
 
     def last(self):
         """
         Based on the handler passed at startup triggers the last slide
         """
         log.debug(u'Live = %s, last' % self.is_live)
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        if self.doc.is_blank():
+        if self.hide_mode:
             self.doc.slidenumber = self.doc.get_slide_count()
+            self.poll()
+            return
+        if not self.activate():
             return
-        self.activate()
         self.doc.goto_slide(self.doc.get_slide_count())
-        self.doc.poll_slidenumber(self.is_live)
+        self.poll()
 
     def next(self):
         """
         Based on the handler passed at startup triggers the next slide event
         """
         log.debug(u'Live = %s, next' % self.is_live)
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        if self.doc.is_blank():
+        if self.hide_mode:
+            if not self.doc.is_active():
+                return
             if self.doc.slidenumber < self.doc.get_slide_count():
                 self.doc.slidenumber = self.doc.slidenumber + 1
+                self.poll()
+            return
+        if not self.activate():
             return
         # The "End of slideshow" screen is after the last slide
         # Note, we can't just stop on the last slide, since it may
         # contain animations that need to be stepped through.
         if self.doc.slidenumber > self.doc.get_slide_count():
             return
-        self.activate()
         self.doc.next_step()
-        self.doc.poll_slidenumber(self.is_live)
+        self.poll()
 
     def previous(self):
         """
         Based on the handler passed at startup triggers the previous slide event
         """
         log.debug(u'Live = %s, previous' % self.is_live)
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        if self.doc.is_blank():
+        if self.hide_mode:
+            if not self.doc.is_active():
+                return
             if self.doc.slidenumber > 1:
                 self.doc.slidenumber = self.doc.slidenumber - 1
+                self.poll()
+            return
+        if not self.activate():
             return
-        self.activate()
         self.doc.previous_step()
-        self.doc.poll_slidenumber(self.is_live)
+        self.poll()
 
     def shutdown(self):
         """
         Based on the handler passed at startup triggers slide show to shut down
         """
         log.debug(u'Live = %s, shutdown' % self.is_live)
+        if not self.doc:
+            return
         self.doc.close_presentation()
         self.doc = None
 
@@ -190,21 +226,30 @@ class Controller(object):
         Instruct the controller to blank the presentation
         """
         log.debug(u'Live = %s, blank' % self.is_live)
+        self.hide_mode = hide_mode
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        if not self.doc.is_loaded():
-            return
-        if not self.doc.is_active():
-            return
         if hide_mode == HideMode.Theme:
+            if not self.doc.is_loaded():
+                return
+            if not self.doc.is_active():
+                return
             Receiver.send_message(u'live_display_hide', HideMode.Theme)
-        self.doc.blank_screen()
+        elif hide_mode == HideMode.Blank:
+            if not self.activate():
+                return
+            self.doc.blank_screen()
 
     def stop(self):
         """
         Instruct the controller to stop and hide the presentation
         """
         log.debug(u'Live = %s, stop' % self.is_live)
+        self.hide_mode = HideMode.Screen
+        if not self.doc:
+            return
         if not self.is_live:
             return
         if not self.doc.is_loaded():
@@ -218,9 +263,13 @@ class Controller(object):
         Instruct the controller to unblank the presentation
         """
         log.debug(u'Live = %s, unblank' % self.is_live)
+        self.hide_mode = None
+        if not self.doc:
+            return
         if not self.is_live:
             return
-        self.activate()
+        if not self.activate():
+            return
         if self.doc.slidenumber and \
             self.doc.slidenumber != self.doc.get_slide_number():
             self.doc.goto_slide(self.doc.slidenumber)
@@ -228,7 +277,9 @@ class Controller(object):
         Receiver.send_message(u'live_display_hide', HideMode.Screen)
 
     def poll(self):
-        self.doc.poll_slidenumber(self.is_live)
+        if not self.doc:
+            return
+        self.doc.poll_slidenumber(self.is_live, self.hide_mode)
 
 
 class MessageListener(object):
diff --git a/openlp/plugins/presentations/lib/powerpointcontroller.py b/openlp/plugins/presentations/lib/powerpointcontroller.py
index 54b9c2144..7da9a95d7 100644
--- a/openlp/plugins/presentations/lib/powerpointcontroller.py
+++ b/openlp/plugins/presentations/lib/powerpointcontroller.py
@@ -94,9 +94,9 @@ class PowerpointController(PresentationController):
                 self.docs[0].close_presentation()
             if self.process is None:
                 return
-            if self.process.Presentations.Count > 0:
-                return
             try:
+                if self.process.Presentations.Count > 0:
+                    return
                 self.process.Quit()
             except pywintypes.com_error:
                 pass
@@ -210,6 +210,13 @@ class PowerpointDocument(PresentationDocument):
         self.presentation.SlideShowSettings.Run()
         self.presentation.SlideShowWindow.View.State = 1
         self.presentation.SlideShowWindow.Activate()
+        if self.presentation.Application.Version == u'14.0':
+            # Unblanking is broken in PowerPoint 2010, need to redisplay
+            slide = self.presentation.SlideShowWindow.View.CurrentShowPosition
+            click = self.presentation.SlideShowWindow.View.GetClickIndex()
+            self.presentation.SlideShowWindow.View.GotoSlide(slide)
+            if click:
+                self.presentation.SlideShowWindow.View.GotoClick(click)
 
     def blank_screen(self):
         """
@@ -253,6 +260,8 @@ class PowerpointDocument(PresentationDocument):
             renderer = self.controller.plugin.renderer
             rect = renderer.screens.current[u'size']
             ppt_window = self.presentation.SlideShowSettings.Run()
+            if not ppt_window:
+                return
             ppt_window.Top = rect.y() * 72 / dpi
             ppt_window.Height = rect.height() * 72 / dpi
             ppt_window.Left = rect.x() * 72 / dpi
@@ -286,6 +295,8 @@ class PowerpointDocument(PresentationDocument):
         """
         log.debug(u'next_step')
         self.presentation.SlideShowWindow.View.Next()
+        if self.get_slide_number() > self.get_slide_count():
+            self.previous_step()
 
     def previous_step(self):
         """
diff --git a/openlp/plugins/presentations/lib/presentationcontroller.py b/openlp/plugins/presentations/lib/presentationcontroller.py
index b72e1e9d4..4006cbc3e 100644
--- a/openlp/plugins/presentations/lib/presentationcontroller.py
+++ b/openlp/plugins/presentations/lib/presentationcontroller.py
@@ -260,16 +260,17 @@ class PresentationDocument(object):
         else:
             return None
 
-    def poll_slidenumber(self, is_live):
+    def poll_slidenumber(self, is_live, hide_mode):
         """
         Check the current slide number
         """
         if not self.is_active():
             return
-        current = self.get_slide_number()
-        if current == self.slidenumber:
-            return
-        self.slidenumber = current
+        if not hide_mode:
+            current = self.get_slide_number()
+            if current == self.slidenumber:
+                return
+            self.slidenumber = current
         if is_live:
             prefix = u'live'
         else:
diff --git a/openlp/plugins/songs/forms/songexportform.py b/openlp/plugins/songs/forms/songexportform.py
index 15239f9c2..1f2988568 100644
--- a/openlp/plugins/songs/forms/songexportform.py
+++ b/openlp/plugins/songs/forms/songexportform.py
@@ -37,6 +37,7 @@ from openlp.core.lib import build_icon, Receiver, SettingsManager, translate, \
     create_separated_list
 from openlp.core.lib.ui import UiStrings, critical_error_message_box
 from openlp.core.ui.wizard import OpenLPWizard, WizardStrings
+from openlp.core.utils import locale_direct_compare
 from openlp.plugins.songs.lib.db import Song
 from openlp.plugins.songs.lib.openlyricsexport import OpenLyricsExport
 
@@ -251,7 +252,8 @@ class SongExportForm(OpenLPWizard):
         # Load the list of songs.
         Receiver.send_message(u'cursor_busy')
         songs = self.plugin.manager.get_all_objects(Song)
-        songs.sort()
+        songs.sort(
+            cmp=locale_direct_compare, key=lambda song: song.sort_string)
         for song in songs:
             # No need to export temporary songs.
             if song.temporary:
diff --git a/openlp/plugins/songs/lib/db.py b/openlp/plugins/songs/lib/db.py
index 36b6d53ad..122d29859 100644
--- a/openlp/plugins/songs/lib/db.py
+++ b/openlp/plugins/songs/lib/db.py
@@ -31,11 +31,11 @@ the Songs plugin
 """
 
 from sqlalchemy import Column, ForeignKey, Table, types
-from sqlalchemy.orm import mapper, relation
+from sqlalchemy.orm import mapper, relation, reconstructor
 from sqlalchemy.sql.expression import func
+from PyQt4 import QtCore
 
 from openlp.core.lib.db import BaseModel, init_db
-from openlp.core.utils import locale_compare
 
 class Author(BaseModel):
     """
@@ -64,14 +64,22 @@ class Song(BaseModel):
     """
     Song model
     """
-    # By default sort the songs by its title considering language specific
-    # characters.
-    def __lt__(self, other):
-        r = locale_compare(self.title, other.title)
-        return True if r < 0 else False
+    def __init__(self):
+        self.sort_string = ''
 
-    def __eq__(self, other):
-        return 0 == locale_compare(self.title, other.title)
+    # This decorator tells sqlalchemy to call this method everytime
+    # any data on this object are updated.
+    @reconstructor
+    def init_on_load(self):
+        """
+        Precompute string to be used for sorting.
+
+        Song sorting is performance sensitive operation.
+        To get maximum speed lets precompute the string
+        used for comparison.
+        """
+        # Avoid the overhead of converting string to lowercase and to QString
+        self.sort_string = QtCore.QString(self.title.lower())
 
 
 class Topic(BaseModel):
diff --git a/openlp/plugins/songs/lib/mediaitem.py b/openlp/plugins/songs/lib/mediaitem.py
index 0808bcba0..05da69f61 100644
--- a/openlp/plugins/songs/lib/mediaitem.py
+++ b/openlp/plugins/songs/lib/mediaitem.py
@@ -39,7 +39,7 @@ from openlp.core.lib import MediaManagerItem, Receiver, ItemCapabilities, \
     check_directory_exists
 from openlp.core.lib.ui import UiStrings, create_widget_action
 from openlp.core.lib.settings import Settings
-from openlp.core.utils import AppLocation
+from openlp.core.utils import AppLocation, locale_direct_compare
 from openlp.plugins.songs.forms import EditSongForm, SongMaintenanceForm, \
     SongImportForm, SongExportForm
 from openlp.plugins.songs.lib import OpenLyrics, SongXML, VerseType, \
@@ -259,7 +259,8 @@ class SongMediaItem(MediaManagerItem):
         log.debug(u'display results Song')
         self.saveAutoSelectId()
         self.listView.clear()
-        searchresults.sort()
+        searchresults.sort(
+            cmp=locale_direct_compare, key=lambda song: song.sort_string)
         for song in searchresults:
             # Do not display temporary songs
             if song.temporary:
diff --git a/openlp/plugins/songs/lib/oooimport.py b/openlp/plugins/songs/lib/oooimport.py
index 49e6c2a70..da96dc936 100644
--- a/openlp/plugins/songs/lib/oooimport.py
+++ b/openlp/plugins/songs/lib/oooimport.py
@@ -27,6 +27,7 @@
 ###############################################################################
 import logging
 import os
+import time
 
 from PyQt4 import QtCore
 
@@ -123,6 +124,7 @@ class OooImport(SongImport):
                 try:
                     uno_instance = get_uno_instance(resolver)
                 except NoConnectException:
+                    time.sleep(0.1)
                     log.exception("Failed to resolve uno connection")
                     self.startOooProcess()
                     loop += 1