Blog post images – grey boxes not picture

Hello,

I am in the process of trying to set up my blog, it hasn’t launched yet. I cannot get an image on the blog posts despites having an image showing in the blog post and ‘use blank image display’ eing unchecked. I have spent days tried to sort this and am completely stuck. Please advise. The image within the post has uploaded without a problem, but all the pictures on my homepage are grey boxes.

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