The image upload I was attempting last night is now working. No changes were made on my side of the browser. /shrug
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@DaveMasonDotMe The system has been under sustained DoS/DDoS attacks for the past couple of days. You'll most likely see issues start to crop up again in another 5 hours or so, if prior attack patterns hold out.
In the grand scheme of things, it's a very short-term inconvenience - just give it time.