diff --git a/openlp/plugins/presentations/lib/impresscontroller.py b/openlp/plugins/presentations/lib/impresscontroller.py
index dbd555b82..599a2e18d 100644
--- a/openlp/plugins/presentations/lib/impresscontroller.py
+++ b/openlp/plugins/presentations/lib/impresscontroller.py
@@ -109,19 +109,16 @@ class ImpressController(PresentationController):
         if os.name == u'nt':
             desktop = self.get_com_desktop()
             url = u'file:///' + presentation.replace(u'\\', u'/').replace(u':', u'|').replace(u' ', u'%20')
-            thumbdir = u'file:///' + self.thumbnailpath.replace(
-                u'\\', u'/').replace(u':', u'|').replace(u' ', u'%20')
         else:
             desktop = self.get_uno_desktop()
             url = uno.systemPathToFileUrl(presentation)
-            thumbdir = uno.systemPathToFileUrl(self.thumbnailpath)
         if desktop is None:
             return
         try:
             properties = []
             properties = tuple(properties)            
-            doc = desktop.loadComponentFromURL(url, u'_blank', 0, properties)
-            self.document = doc
+            self.document = desktop.loadComponentFromURL(url, u'_blank',
+                0, properties)
             self.presentation = self.document.getPresentation()
             self.presentation.Display = self.plugin.render_manager.current_display + 1
             self.presentation.start()
@@ -130,6 +127,20 @@ class ImpressController(PresentationController):
         except:
             log.exception(u'Failed to load presentation')
             return
+        self.create_thumbnails()
+
+    def create_thumbnails(self):
+        """
+        Create thumbnail images for presentation
+        """
+        if self.check_thumbnails():
+            return
+
+        if os.name == u'nt':
+            thumbdir = u'file:///' + self.thumbnailpath.replace(
+                u'\\', u'/').replace(u':', u'|').replace(u' ', u'%20')
+        else:
+            thumbdir = uno.systemPathToFileUrl(self.thumbnailpath)
         props = []
         if os.name == u'nt':
             prop = self.manager.Bridge_GetStruct(u'com.sun.star.beans.PropertyValue')
@@ -139,6 +150,7 @@ class ImpressController(PresentationController):
         prop.Value = u'impress_png_Export'
         props.append(prop)
         props = tuple(props)
+        doc = self.document
         pages = doc.getDrawPages()
         for idx in range(pages.getCount()):
             page = pages.getByIndex(idx)
@@ -255,4 +267,4 @@ class ImpressController(PresentationController):
         The slide an image is required for, starting at 1
         """
         return os.path.join(self.thumbnailpath,
-            self.thumbnailprefix + slide_no + u'.png')
+            self.thumbnailprefix + unicode(slide_no) + u'.png')
diff --git a/openlp/plugins/presentations/lib/mediaitem.py b/openlp/plugins/presentations/lib/mediaitem.py
index 356cf3acc..52c22f6f9 100644
--- a/openlp/plugins/presentations/lib/mediaitem.py
+++ b/openlp/plugins/presentations/lib/mediaitem.py
@@ -98,11 +98,22 @@ class PresentationMediaItem(MediaManagerItem):
                 self.DisplayTypeComboBox.addItem(item)
 
     def loadList(self, list):
+        currlist = self.getFileList()
+        titles = []
+        for file in currlist:
+            titles.append(os.path.split(file)[1])
         for file in list:
+            if currlist.count(file) > 0:
+                continue
             (path, filename) = os.path.split(unicode(file))
-            item_name = QtGui.QListWidgetItem(filename)
-            item_name.setData(QtCore.Qt.UserRole, QtCore.QVariant(file))
-            self.ListView.addItem(item_name)
+            if titles.count(filename) > 0:
+                QtGui.QMessageBox.critical(self, u'File exists',
+                    u'A presentation with that filename already exists.',
+                    QtGui.QMessageBox.Ok)
+            else:
+                item_name = QtGui.QListWidgetItem(filename)
+                item_name.setData(QtCore.Qt.UserRole, QtCore.QVariant(file))
+                self.ListView.addItem(item_name)
 
     def onDeleteClick(self):
         item = self.ListView.currentItem()
@@ -111,7 +122,10 @@ class PresentationMediaItem(MediaManagerItem):
             row = self.ListView.row(item)
             self.ListView.takeItem(row)
             self.parent.config.set_list(
-                self.ConfigSection, self.ListData.getFileList())
+                self.ConfigSection, self.getFileList())
+            filepath = unicode((item.data(QtCore.Qt.UserRole)).toString())
+            for cidx in self.controllers:
+                self.controllers[cidx].presentation_deleted(filepath)
 
     def generateSlideData(self, service_item):
         items = self.ListView.selectedIndexes()
diff --git a/openlp/plugins/presentations/lib/powerpointcontroller.py b/openlp/plugins/presentations/lib/powerpointcontroller.py
index 8d4d61f62..9b9e55e46 100644
--- a/openlp/plugins/presentations/lib/powerpointcontroller.py
+++ b/openlp/plugins/presentations/lib/powerpointcontroller.py
@@ -107,12 +107,25 @@ class PowerpointController(PresentationController):
             self.store_filename(presentation)
             self.process.Presentations.Open(presentation, False, False, True)
             self.presentation = self.process.Presentations(self.process.Presentations.Count)
+            self.create_thumbnails()
+            self.start_presentation()
+
+        def create_thumbnails(self):
+            """
+            Create the thumbnail images for the current presentation.
+            Note an alternative and quicker method would be do
+                self.presentation.Slides[n].Copy()
+                thumbnail = QApplication.clipboard.image()
+            But for now we want a physical file since it makes
+            life easier elsewhere
+            """
+            if self.check_thumbnails():
+                return
             self.presentation.Export(os.path.join(self.thumbnailpath, '')
                                      , 'png', 600, 480)
-            # self.presentation.Slides[n].Copy()
-            # thumbnail = QClipboard.image()
-            self.start_presentation()
             
+    
+
         def close_presentation(self):
             """
             Close presentation and clean up objects
@@ -207,4 +220,4 @@ class PowerpointController(PresentationController):
             The slide an image is required for, starting at 1
             """
             return os.path.join(self.thumbnailpath,
-                self.thumbnailprefix + slide_no + u'.png')
+                self.thumbnailprefix + unicode(slide_no) + u'.png')
diff --git a/openlp/plugins/presentations/lib/pptviewcontroller.py b/openlp/plugins/presentations/lib/pptviewcontroller.py
index 2d28aea8f..113af072a 100644
--- a/openlp/plugins/presentations/lib/pptviewcontroller.py
+++ b/openlp/plugins/presentations/lib/pptviewcontroller.py
@@ -198,5 +198,5 @@ class PptviewController(PresentationController):
                 The slide an image is required for, starting at 1
             """
             return os.path.join(self.thumbnailpath,
-                self.thumbnailprefix + slide_no + u'.bmp')
+                self.thumbnailprefix + unicode(slide_no) + u'.bmp')
 
diff --git a/openlp/plugins/presentations/lib/presentationcontroller.py b/openlp/plugins/presentations/lib/presentationcontroller.py
index 74da9fc91..a87797a2d 100644
--- a/openlp/plugins/presentations/lib/presentationcontroller.py
+++ b/openlp/plugins/presentations/lib/presentationcontroller.py
@@ -20,6 +20,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 
 import logging
 import os
+import shutil
 
 from PyQt4 import QtCore
 
@@ -35,7 +36,7 @@ class PresentationController(object):
     Make sure it inhetits PresentationController
     Then fill in the blanks. If possible try and make sure it loads
     on all platforms, using for example os.name checks, although
-    __init__ and check_available should always work.
+    __init__, check_available and presentation_deleted should always work.
     See impresscontroller, powerpointcontroller or pptviewcontroller
     for examples.
 
@@ -61,6 +62,9 @@ class PresentationController(object):
 
     ``check_available()``
         Returns True if presentation application is installed/can run on this machine
+    
+    ``presentation_deleted()``
+        Deletes presentation specific files, e.g. thumbnails
 
     ``load_presentation(presentation)``
         Load a presentation file
@@ -136,11 +140,8 @@ class PresentationController(object):
         self.thumbnailroot = os.path.join(plugin.config.get_data_path(),
             name, u'thumbnails')
         self.thumbnailprefix = u'slide'
-        try:
+        if not os.path.isdir(self.thumbnailroot):
             os.makedirs(self.thumbnailroot)
-        except:
-            pass
-            
 
     def check_available(self):
         """
@@ -148,6 +149,14 @@ class PresentationController(object):
         """
         return False
 
+    def presentation_deleted(self, presentation):
+        """
+        Cleans up/deletes any controller specific files created for
+        a file, e.g. thumbnails
+        """
+        self.store_filename(presentation)
+        shutil.rmtree(self.thumbnailpath)
+    
     def start_process(self):
         """
         Loads a running version of the presentation application in the background.
@@ -179,10 +188,20 @@ class PresentationController(object):
         self.filepath = presentation
         self.filename = os.path.split(presentation)[1]
         self.thumbnailpath = os.path.join(self.thumbnailroot, self.filename)
-        try:
+        if not os.path.isdir(self.thumbnailpath):
             os.mkdir(self.thumbnailpath)
-        except:
-            pass
+
+    def check_thumbnails(self):
+        """
+        Returns true if the thumbnail images look to exist and are more
+        recent than the powerpoint
+        """
+        lastimage = self.get_slide_preview_file(self.get_slide_count())
+        if not os.path.isfile(lastimage):
+            return False
+        imgdate = os.stat(lastimage).st_mtime
+        pptdate = os.stat(self.filepath).st_mtime
+        return imgdate >= pptdate
 
     def close_presentation(self):
         """