There is known problem with macOS Sierra 10.12.2+ and slideshows created in PicturesToExe 6.0 - 8.0.21. Slideshows do not start and only black screen appears. Solution 1: Download and install PicturesToExe 8.0.23. Or download new PicturesToExe 9.  Open project file with existing slideshow and create a new presentation folder for Mac. Solution 2 You can repair existing slideshows for Mac using special free utility: https://files.wnsoft.com/soft/RepairMacPresenta