Example (scroll to the end of the page) - http://vgchartz.com/forum/thread.php?id=21181&start=0

I think this is the same problem which happened to me yesterday. It also happened when I posted a reply with a quote.

I managed to get the thread usable again by editing the post I had just made to remove the quote, which was quite complicated because I had to get the post number manually (the edit button is not visible because the thread is broken).

It appears to be caused by this handy little token:

<!--

Though, try as I might, I can't seem to embed it into a post, nor any of that VML stuff that's in yours.

ioi is messing with our heads

That's just an HTML comment, I haven't looked closely but I don't think it's the reason. If you look for the VML stuff, it's all over the code, not just there.

Maybe I was being a little to subtle. You're posting text that contains embedded conditional comments for some VML markup. There's a mismatched conditional comment in one of your posts. The text you quoted from StarcraftManiac was probably mixed in with some VML diagrams when he copied and pasted it. It's not "all over the code", it's inside messages. It's also not in this page, for instance. Look again.

Simply put, the token slipping through unescaped and unparsed is the reason why the page broke. I'm a computer scientist, I know these things. You're not going to like this, but as seen below:

<!--[if gte vml 1]>