It's due to the fact that they've disabled untrusted (or more specifically, only allow trusted) image hosts, such as Imgur, and Gyazo I believe.
Either upload on one of the sites mentioned above, or attach the image via 'Upload A File' at the bottom, and then click the 'Full Image' button once it's uploaded.
As others have said, while our image proxy was not set up we only allowed images from imgur/gyazo/other trusted sources. Now that we do have our image proxy any images will work once again.
I'll move this to the bug report archives, thanks.
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