I just found a weird bug: When I click on Quote to respond to a particular post the 'X' key on my keyboard won't work for whatever reason. I don't have that problem when I just use the Quick Reply to write something.
Edit: It's the same when I click on New Reply or try to start a new thread. I can type stuff but I can't use the X. How peculiar.
I'm using a Swedish QWERTY keyboard. Never encountered this problem before. Is it the same for you, Rex?