[DustyPorViva]

It doesn't work in quick reply. It's not a matter of how you post, it's a matter of what you post. I just tried posting a script I KNOW gave me problems from the code gallery in quick reply and it just stalls. Same with quick edit. If you attempt it in quick* it just won't do it. It'll sit there forever. If you do it from advanced, it'll send you to the bad request page.

Given it gave me problems back then, and still does now, I think it's safe to assume it only gives a bad request on given circumstances. We just don't know the circumstances :/