@kali66@granagringa Like Kali said, if your browser window is not big enough to hold the full image in the "album" view, like when you've zoomed in too far, it won't execute "display on black," at least on the standard browsers. I don't know what quirks Ross might have used to code this function back when. It is different from the "Album" view, scroll bars are used there even if the image is too big. Not in the "view on black" mode.
@kali66 This worked! Thank you so much, this worked. I'm very impressed that you figured this out. Of course, now I have to go back and forth on size to either see on black or read anything...even with my glasses.