When I am submitting a forum post, I get a new window telling me that there was a "Bad Request" If needed, I can post exactly what the new window says.
And by the way, if there is a "r" at the end of this post, I got the Bad Request window after submitting.
Hmm... I googled it, but there wasn't really anything good. Did the error message say anything else, like "Size of a request header field exceeds server limit."? Or "size of a request header field exceeds server limit cookie ?"
If it also has one of those two messages, the solution (what google said) is to go to your cookies and delete the ones for armorgames.com.
I'm guessing you got the message again? (because you put the Pr)
Maybe someone else can help you better than me, I'm not really a computer person for stuff like that.