diff --git a/openlp/plugins/presentations/lib/impresscontroller.py b/openlp/plugins/presentations/lib/impresscontroller.py
index 6c360355c..10add26b4 100644
--- a/openlp/plugins/presentations/lib/impresscontroller.py
+++ b/openlp/plugins/presentations/lib/impresscontroller.py
@@ -181,7 +181,7 @@ class ImpressController(PresentationController):
 class ImpressDocument(PresentationDocument):
     def __init__(self, controller, presentation):
         log.debug(u'Init Presentation OpenOffice')
-        PresentationDocument.__init__(controller, presentation)
+        PresentationDocument.__init__(self, controller, presentation)
         self.document = None
         self.presentation = None
         self.control = None
diff --git a/openlp/plugins/presentations/lib/messagelistener.py b/openlp/plugins/presentations/lib/messagelistener.py
index 0e98b377a..c6ab1e921 100644
--- a/openlp/plugins/presentations/lib/messagelistener.py
+++ b/openlp/plugins/presentations/lib/messagelistener.py
@@ -29,6 +29,7 @@ import os
 from PyQt4 import QtCore
 
 from openlp.core.lib import Receiver
+from openlp.core.ui import HideMode
 
 log = logging.getLogger(__name__)
 
@@ -55,7 +56,7 @@ class Controller(object):
             self.doc.start_presentation()
             if isBlank:
                 self.blank()
-            Receiver.send_message(u'maindisplay_hide')
+            Receiver.send_message(u'maindisplay_hide', HideMode.Screen)
         self.doc.slidenumber = 0
 
     def activate(self):
@@ -179,6 +180,7 @@ class Controller(object):
             self.doc.slidenumber != self.doc.get_slide_number():
             self.doc.goto_slide(self.doc.slidenumber)
         self.doc.unblank_screen()
+        Receiver.send_message(u'maindisplay_hide', HideMode.Screen)
 
     def poll(self):
         self.doc.poll_slidenumber(self.isLive)
diff --git a/openlp/plugins/presentations/lib/powerpointcontroller.py b/openlp/plugins/presentations/lib/powerpointcontroller.py
index 760869f7a..93c48e86c 100644
--- a/openlp/plugins/presentations/lib/powerpointcontroller.py
+++ b/openlp/plugins/presentations/lib/powerpointcontroller.py
@@ -104,7 +104,7 @@ class PowerpointController(PresentationController):
 class PowerpointDocument(PresentationDocument):
     def __init__(self, controller, presentation):
         log.debug(u'Init Presentation Powerpoint')
-        PresentationDocument.__init__(controller, presentation)
+        PresentationDocument.__init__(self, controller, presentation)
         self.presentation = None
 
     def load_presentation(self):
@@ -142,7 +142,7 @@ class PowerpointDocument(PresentationDocument):
         if self.check_thumbnails():
             return
         self.presentation.Export(os.path.join(self.thumbnailpath, ''), 'png',
-            640, 480)
+            320, 240)
 
     def close_presentation(self):
         """
diff --git a/openlp/plugins/presentations/lib/pptviewcontroller.py b/openlp/plugins/presentations/lib/pptviewcontroller.py
index 409a0b760..42a12be1d 100644
--- a/openlp/plugins/presentations/lib/pptviewcontroller.py
+++ b/openlp/plugins/presentations/lib/pptviewcontroller.py
@@ -102,7 +102,7 @@ class PptviewController(PresentationController):
 class PptviewDocument(PresentationDocument):
     def __init__(self, controller, presentation):
         log.debug(u'Init Presentation PowerPoint')
-        PresentationDocument.__init__(controller, presentation)
+        PresentationDocument.__init__(self, controller, presentation)
         self.presentation = None
         self.pptid = None
         self.blanked = False