You might want to check your firewall settings. I found I couldn't view any images one time and I discovered I had accidentally disallowed something in my firewall (Norton). I ended up having to reinstall the damn firewall as I couldn't work out how to re-allow images. Every time I wanted to view images I had to turn the flaming thing off (NOT something I wanted to do.)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire