I remember having this problem years ago when I was using a PC, but my home sharing photos have always shown up in the four years I've been using a Mac, until today. All the other Home Sharing media (Music, Movies, Home Movies, Podcasts, etc.) show up just fine, but on my ATV3 I get "Loading *******'s Library" and a spinning wheel, and on the ATV4 I just get a spinning wheel when trying to access photos. This is driving me crazy. I like to use Home Sharing photos as my screen saver. I did swap out my old router for a new one about six months ago, but I could've sworn it's worked since then, and I don't recall having to set up any exceptions or port forwarding to get it to work.