At first, I couldn't see anything either. I kept going back and forth, rubbing my eyes and squinting at the pics, and got nowhere. I read Mikezumi's description of the issue, and I could just barely make out a couple of changes. Then I realized that I was supposed to be looking at the portraits, not the thumbnails.
By the way, @Mikezumi, while you're in windowed mode, you can also get a pic with Windows key-shift-S, and then drag your cursor over the area you want to capture. (at least in Windows 10) The screenshot winds up on the clipboard for you to paste into whatever app you want.