I remember this happening before, and I posted this node. I can remember the circumstances being due to a node with missing code tags. This allowed some HTML tags in the code to influence layout of the page.

That time, it was quite easy to spot and consider the offending node. However, I remember that this was a weekend and there were no editors in the house - leaving SoPW broken for several hours with nobody able to post.

I wonder, is there anything we can do to improve the robustness of the surrounding Everything page. Or failing this, introduce html checking as per my original suggestion.