Since moving to the latest hot fix 2.6.8.0 I am randomly experiencing the following error
System.NullReferenceException: Object reference not set to an instance of an object.
at Aspose.Slides.Presentation.set_SlideSize(Size value)
I am unable to replicate this at will, but I can say that the parameters were ok and it seemed to be a bug in the API.
Can you please show your code and also the presentation which caused this?