I see it anytime I scroll down a bunch??? Instead of images it shows little white boxes. I went scrolling through my page a while back looking to save some drawings and after it has to load more posts, they start popping up and keep popping up. Here's an example from a few minutes ago, scrolling down my profile.

Edit: It doesn't seem to happen when you scroll down the front page of Daily Art, just like...an individual's page.