diff --git a/openlp/core/ui/slidecontroller.py b/openlp/core/ui/slidecontroller.py
index e701c3a82..316243b91 100644
--- a/openlp/core/ui/slidecontroller.py
+++ b/openlp/core/ui/slidecontroller.py
@@ -25,10 +25,11 @@
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
 
-import logging
 import os
+import logging
 import time
 import copy
+from collections import deque
 
 from PyQt4 import QtCore, QtGui
 from PyQt4.phonon import Phonon
@@ -114,6 +115,8 @@ class SlideController(Controller):
             self.typeLabel.setText(UiStrings().Live)
             self.split = 1
             self.typePrefix = u'live'
+            self.keypress_queue = deque() 
+            self.keypress_loop = False           
         else:
             self.typeLabel.setText(UiStrings().Preview)
             self.split = 0
@@ -565,12 +568,34 @@ class SlideController(Controller):
         self.mediaController.video_stop([self])
 
     def servicePrevious(self):
-        time.sleep(0.1)
-        Receiver.send_message('servicemanager_previous_item')
+        """
+        Live event to select the previous service item from the service manager.
+        """
+        self.keypress_queue.append(u'previous')
+        self._process_queue()
+        
 
     def serviceNext(self):
-        time.sleep(0.1)
-        Receiver.send_message('servicemanager_next_item')
+        """
+        Live event to select the next service item from the service manager.
+        """
+        self.keypress_queue.append(u'next')
+        self._process_queue()
+        
+    def _process_queue(self):
+        """
+        Process the service item request queue.  The key presses can arrive 
+        faster than the processing so implement a FIFO queue. 
+        """
+        if len(self.keypress_queue):
+            while len(self.keypress_queue) and not self.keypress_loop:
+                self.keypress_loop = True                
+                if self.keypress_queue.popleft() == u'previous':
+                    Receiver.send_message('servicemanager_previous_item')                    
+                else:
+                    Receiver.send_message('servicemanager_next_item')
+            self.keypress_loop = False
+     
 
     def screenSizeChanged(self):
         """
@@ -773,7 +798,7 @@ class SlideController(Controller):
         log.debug(u'processManagerItem live = %s' % self.isLive)
         self.onStopLoop()
         old_item = self.serviceItem
-        # take a copy not a link to the servicemeanager copy.
+        # take a copy not a link to the servicemanager copy.
         self.serviceItem = copy.copy(serviceItem)
         if old_item and self.isLive and old_item.is_capable(
             ItemCapabilities.ProvidesOwnDisplay):
diff --git a/openlp/plugins/songs/lib/olpimport.py b/openlp/plugins/songs/lib/olpimport.py
index 7d2558ce8..75e149fad 100644
--- a/openlp/plugins/songs/lib/olpimport.py
+++ b/openlp/plugins/songs/lib/olpimport.py
@@ -124,7 +124,7 @@ class OpenLPSongImport(SongImport):
         if has_media_files:
             source_media_files_table = source_meta.tables[u'media_files']
             source_media_files_songs_table = \
-                source_meta.tables[u'media_files_songs']
+                source_meta.tables.get(u'media_files_songs')
             try:
                 class_mapper(OldMediaFile)
             except UnmappedClassError:
@@ -137,8 +137,13 @@ class OpenLPSongImport(SongImport):
             secondary=source_songs_topics_table)
         }
         if has_media_files:
-            song_props['media_files'] = relation(OldMediaFile, backref='songs',
-                secondary=source_media_files_songs_table)
+            if source_media_files_songs_table:
+                song_props['media_files'] = relation(OldMediaFile,
+                    backref='songs',
+                    secondary=source_media_files_songs_table)
+            else:
+                song_props['media_files'] = relation(OldMediaFile,
+                    backref='songs')
         try:
             class_mapper(OldAuthor)
         except UnmappedClassError:
diff --git a/openlp/plugins/songs/lib/upgrade.py b/openlp/plugins/songs/lib/upgrade.py
index 21988c267..7752c7e33 100644
--- a/openlp/plugins/songs/lib/upgrade.py
+++ b/openlp/plugins/songs/lib/upgrade.py
@@ -68,9 +68,9 @@ def upgrade_1(session, metadata, tables):
     """
     Table(u'media_files_songs', metadata, autoload=True).drop(checkfirst=True)
     Column(u'song_id', types.Integer(), default=None)\
-        .create(table=tables[u'media_files'], populate_default=True)
+        .create(table=tables[u'media_files'])
     Column(u'weight', types.Integer(), default=0)\
-        .create(table=tables[u'media_files'], populate_default=True)
+        .create(table=tables[u'media_files'])
     if metadata.bind.url.get_dialect().name != 'sqlite':
         # SQLite doesn't support ALTER TABLE ADD CONSTRAINT
         ForeignKeyConstraint([u'song_id'], [u'songs.id'],
@@ -83,6 +83,7 @@ def upgrade_2(session, metadata, tables):
     This upgrade adds a create_date and last_modified date to the songs table
     """
     Column(u'create_date', types.DateTime(), default=func.now())\
-        .create(table=tables[u'songs'], populate_default=True)
+        .create(table=tables[u'songs'])
     Column(u'last_modified', types.DateTime(), default=func.now())\
-        .create(table=tables[u'songs'], populate_default=True)
+        .create(table=tables[u'songs'])
+