This conversation has been merged. Please reference the main conversation: Lightroom 6.1.1: Won't build preview in slideshow module
I saw a post in another thread suggesting that Slideshow "needs" a video card with officially supported GPU - is this true?
I am running an older Mac Pro, OSX 10.10.5, upgraded with 32GB RAM, SSD disks, etc., but with the original nVidia GT120 card (Adobe lists as "unsupported"), so I have unchecked "Use GPU Acceleration" (or whatever it's called) option in Lightroom. Everything else about the app seems to run fine.
I used to use Slideshow quite a bit, but haven't for at least the last few dot-updates of LR. Is there no way to use Slideshow anymore without a supported video card?
Thanks for any enlightenment...