Unfortunately, PowerPoint prevents the screen saver from starting while a slideshow is running, and this also affects the DisplayFusion Screen Saver. I've tried a few different things to allow the screen saver to run while a PowerPoint slideshow is running with no success

A quick Google search turned up this app: http://www.adingod.com/kiosk.html, but I haven't tested it. It looks kind of old, so no idea whether it will actually work or not, so try it at your own risk

I'll keep this on my list for now in case I come up with any other ideas.

Have a great weekend!