Both the controller and postPropertiesForm needs to know that changes have been saved.

src/managed/OpenLiveWriter.PostEditor/PostPropertyEditing/PostPropertiesBandControl.cs

@@ -294,6 +294,7 @@ namespace OpenLiveWriter.PostEditor.PostPropertyEditing
 
         public void SaveChanges(BlogPost post, BlogPostSaveOptions options)
         {
+            controller.SaveChanges(post, options);
             ((IBlogPostEditor)postPropertiesForm).SaveChanges(post, options);
         }