I used Lightroom 6.0 and created a slideshow which worked fine. I automatically updated to LR 6.1.1 and had many random problems with the slide show. The most common was that the slide show would stop running and return to the Slideshow module (just as though I had hit the ESC key). Sometimes it would just go to a blank screen with the music still playing. Finally, I rolled back to LR 6.0 and the problems went away. I am running on Windows 8.1.