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Slides Presentation save to httpresponse stream issue .NET

In C#, when I save a presentation to the httpresponse stream:

Pres.Save(OutputFileName + “.pptx”, Aspose.Slides.Export.SaveFormat.Pptx, Response, false);

(where Pres is of type Presentation)

everything works in version 15.11, using runtime version 4.0.30319. Upgrading to the latest version of Slides I can find,, same runtime, causes the file to open in Powerpoint with a blank screen with no slide thumbnails on the left (see attached screenshot)PPT error.png (4.6 KB)
. Toggling the “notes” button makes the slides visible, but still no thumbnails on the left. The pptx file is also 1 kB larger than the one that opens correctly.


I have observed your comments. Can you please try to use Aspose.Slides latest version 18.3 on your end and if there is still an issue than please share sample code, along with source presentation and generated result so that we may further investigate to help you out.