Dragging an image into a reply window supposedly creates a zip file, but when the post is created that link results in an image file that shows as empty. And trying to use the upload button fails to upload an image.
So sorry I missed this earlier! The good news is that in the intervening days since you wrote this, the service has been restored.
It turns out that the recent surge in activity here on the COW required us to spin up a new server. We had to turn off the site for a few minutes to do that, so we waited until last Friday night, Pacific Time Zone, to do it. Most of the world had paused to take a breather by then, so very people might have noticed.
In the meantime, another service not fully up to snuff is our email notification system, so I hadn't gotten a notice that anyone posted here. Yikes! Working on that one now.