PowerPoint 2016 and Windows 10 - Capturing presentation window not possible

• I have a C# app that captures running presentation's window.
• It uses SlideShowWindow's HWND to capture the rendered view.
• It uses GDI for capturing the window.
• It works fine from 2007-2013, but 2016 in Windows 10 fails.
• I've tried, for example, other screen recording / video rec tools which capture only a particular window - and providing these tool with PPT window also fails. They capture only black / blank window.

Is there something else that needs to be done for 2016 to get this working?