Replying to Pictures people have posted in threads arent showing up?

Just wondering if this is just my computer/browser/internet. just recently like 80% of the pictures/previews on this site have stopped showing up for me, in their place is a very small "file" shape filled with a hill and some clouds with a diaganol line going through it. Not sure if its the site or not because my phone doesn't show ns pictures anyways, any help, advice, or explanation would be cool! +k for useful tips or info