Perhaps your opinions suck? Sorry, I couldn't help myself. If you put the ball on the tee for me, I'm going to have to swing at it.
It's not a cookie problem! It's a network problem. Your ISP or your ISP's ISP or their ISP must have been suffering some sort of temporary outage. It has nothing to do with S2.
404 page is delivered by the server, so he'd have to be able to reach it. The javascript in the quick reply editor simply timed out trying to send the post to the server. Trust me