What is happening?

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A lot of the images posted, won't open.
This is what I am getting.

That is odd. My screen shot won't load, either.
This is my second edit.

The image I see on posts, has shown up here. But as soon as I click on 'Save Changes', it vanishes. 

[Sepiana]

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As of this writing, I'm not having this problem. However, I have encountered it before.  It seems to happen when the imgbb servers are busy. Try reloading/refreshing the page (F5). It usually works for me. 

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Thanks Sepiana.
Just come back on now, and things are back to normal.
I had thought it was my computer playing up - again.