diff --git a/openlp/plugins/presentations/lib/powerpointcontroller.py b/openlp/plugins/presentations/lib/powerpointcontroller.py
index 2af547627..3d0c60597 100644
--- a/openlp/plugins/presentations/lib/powerpointcontroller.py
+++ b/openlp/plugins/presentations/lib/powerpointcontroller.py
@@ -156,6 +156,16 @@ class PowerpointDocument(PresentationDocument):
             trace_error_handler(log)
             return False
 
+    def check_thumbnails(self):
+        """
+        This is an overwritten method of the method in the PresentationDocument class. It adds a check for content
+        in self.index_map.
+
+        :return: If the thumbnail is valid
+        :rtype: bool
+        """
+        return super().check_thumbnails() and bool(self.index_map)
+
     def create_thumbnails(self):
         """
         Create the thumbnail images for the current presentation.
@@ -169,7 +179,7 @@ class PowerpointDocument(PresentationDocument):
         """
         log.debug('create_thumbnails')
         generate_thumbs = True
-        if self.check_thumbnails():
+        if super().check_thumbnails():
             # No need for thumbnails but we still need the index
             generate_thumbs = False
         key = 1
@@ -206,7 +216,7 @@ class PowerpointDocument(PresentationDocument):
         """
         log.debug('is_loaded')
         try:
-            if self.controller.process.Presentations.Count == 0:
+            if self.presentation is None or self.presentation.FullName != str(self.file_path):
                 return False
         except (AttributeError, pywintypes.com_error):
             log.exception('Caught exception while in is_loaded')
@@ -395,7 +405,7 @@ class PowerpointDocument(PresentationDocument):
             # SlideShowWindow.View.CurrentShowPosition returns 0 when called when a transition is executing (in 2013)
             # So we use SlideShowWindow.View.Slide.SlideIndex unless the state is done (ppSlideShowDone = 5)
             if self.presentation.SlideShowWindow.View.State != 5:
-                ret = self.presentation.SlideShowWindow.View.Slide.SlideNumber
+                ret = self.presentation.SlideShowWindow.View.Slide.SlideIndex
                 # Do reverse lookup in the index_map to find the slide number to return
                 ret = next((key for key, slidenum in self.index_map.items() if slidenum == ret), None)
             else: