diff --git a/openlp/core/ui/slidecontroller.py b/openlp/core/ui/slidecontroller.py
index 7faf10ca2..0eef46b4a 100644
--- a/openlp/core/ui/slidecontroller.py
+++ b/openlp/core/ui/slidecontroller.py
@@ -495,14 +495,14 @@ class SlideController(DisplayController, RegistryProperties):
             self.on_theme_display(False)
             self.on_hide_display(False)
 
-    def service_previous(self):
+    def service_previous(self, field=None):
         """
         Live event to select the previous service item from the service manager.
         """
         self.keypress_queue.append(ServiceItemAction.Previous)
         self._process_queue()
 
-    def service_next(self):
+    def service_next(self, field=None):
         """
         Live event to select the next service item from the service manager.
         """
diff --git a/openlp/plugins/presentations/lib/pdfcontroller.py b/openlp/plugins/presentations/lib/pdfcontroller.py
index 597b7d78b..3dc75ba0b 100644
--- a/openlp/plugins/presentations/lib/pdfcontroller.py
+++ b/openlp/plugins/presentations/lib/pdfcontroller.py
@@ -204,19 +204,19 @@ class PdfDocument(PresentationDocument):
             log.debug(' '.join(e.cmd))
             log.debug(e.output)
         # Extract the pdf resolution from output, the format is " Size: x: <width>, y: <height>"
-        width = 0
-        height = 0
+        width = 0.0
+        height = 0.0
         for line in runlog.splitlines():
             try:
-                width = int(re.search('.*Size: x: (\d+\.?\d*), y: \d+.*', line.decode()).group(1))
-                height = int(re.search('.*Size: x: \d+\.?\d*, y: (\d+\.?\d*).*', line.decode()).group(1))
+                width = float(re.search('.*Size: x: (\d+\.?\d*), y: \d+.*', line.decode()).group(1))
+                height = float(re.search('.*Size: x: \d+\.?\d*, y: (\d+\.?\d*).*', line.decode()).group(1))
                 break
             except AttributeError:
-                pass
+                continue
         # Calculate the ratio from pdf to screen
         if width > 0 and height > 0:
-            width_ratio = size.right() / float(width)
-            height_ratio = size.bottom() / float(height)
+            width_ratio = size.right() / width
+            height_ratio = size.bottom() / height
             # return the resolution that should be used. 72 is default.
             if width_ratio > height_ratio:
                 return int(height_ratio * 72)
diff --git a/openlp/plugins/presentations/lib/presentationcontroller.py b/openlp/plugins/presentations/lib/presentationcontroller.py
index fd636b468..6c8d7fb8c 100644
--- a/openlp/plugins/presentations/lib/presentationcontroller.py
+++ b/openlp/plugins/presentations/lib/presentationcontroller.py
@@ -122,8 +122,10 @@ class PresentationDocument(object):
         a file, e.g. thumbnails
         """
         try:
-            shutil.rmtree(self.get_thumbnail_folder())
-            shutil.rmtree(self.get_temp_folder())
+            if os.path.exists(self.get_thumbnail_folder()):
+                shutil.rmtree(self.get_thumbnail_folder())
+            if os.path.exists(self.get_temp_folder()):
+                shutil.rmtree(self.get_temp_folder())
         except OSError:
             log.exception('Failed to delete presentation controller files')