Yeah, you didn't turn autorun off. This is a half bug. (well, maybe 2/3

) The whole point of autorun is to run while chatting, so it needs to stay on there. You never turned it off. That being said, I need to come up with some odd way to detect when you are pressing a key to kill it and when you just want to add to it. (ex: jumpping or turning)
I blame Bereror.

He noted that it did stop when clicking the chat window, so I made a quick fix.
