Niner, I'm not sure. I know this happened to me before.........some pics were embedded and I couldn't see them. Days later, I could. I did nothing.
This time, I decided to try something, anything. So I changed Styles. That fixed it. Makes no sense to me whatsoever. I'm not even on the Secret Committee.
I just changed it back to the Default Style, and now I can see it also.
Beats me, man. Maybe, like many applications, it doesn't like Firefox..........????