Nothing on your end. I pulled a couple more tricks on my end, but it didn't seem to take. We have a couple other communities experiencing the same issue. I've added this site to the list.
For now, there is a workaround - you can right-click on the thumbnail, and 'view in new tab'. It'll get you the full size view at least in the meantime. Alternatively, you can use another browser, though that is a much bigger change and we understand if you would rather not.