diff --git a/openlp/plugins/presentations/lib/impresscontroller.py b/openlp/plugins/presentations/lib/impresscontroller.py
index c4250f27a..8dc4861aa 100644
--- a/openlp/plugins/presentations/lib/impresscontroller.py
+++ b/openlp/plugins/presentations/lib/impresscontroller.py
@@ -222,7 +222,7 @@ class ImpressDocument(PresentationDocument):
             return
         self.presentation = self.document.getPresentation()
         self.presentation.Display = \
-            self.controller.plugin.render_manager.screens.current_display + 1
+            self.controller.plugin.renderManager.screens.current_display + 1
         self.control = None
         self.create_thumbnails()
 
diff --git a/openlp/plugins/presentations/lib/powerpointcontroller.py b/openlp/plugins/presentations/lib/powerpointcontroller.py
index e7126990d..00ded85f6 100644
--- a/openlp/plugins/presentations/lib/powerpointcontroller.py
+++ b/openlp/plugins/presentations/lib/powerpointcontroller.py
@@ -173,7 +173,7 @@ class PowerpointDocument(PresentationDocument):
         return True
 
 
-    def isActive(self):
+    def is_active(self):
         """
         Returns true if a presentation is currently active
         """
@@ -206,7 +206,7 @@ class PowerpointDocument(PresentationDocument):
         """
         Returns true if screen is blank
         """
-        if self.isActive():
+        if self.is_active():
             return self.presentation.SlideShowWindow.View.State == 3
         else:
             return False
@@ -233,7 +233,7 @@ class PowerpointDocument(PresentationDocument):
                     dpi = 96
             self.presentation.SlideShowSettings.Run()
             self.presentation.SlideShowWindow.View.GotoSlide(1)
-            rendermanager = self.controller.plugin.render_manager
+            rendermanager = self.controller.plugin.renderManager
             rect = rendermanager.screens.current[u'size']
             self.presentation.SlideShowWindow.Top = rect.y() * 72 / dpi
             self.presentation.SlideShowWindow.Height = rect.height() * 72 / dpi