This has been happening to me a few times already, more so lately. Not sure if it happens to somebody else or it has anything to do with my browser. When done replying to others posts, I click the 'Submit Reply' button and the message that I need to login in BF so I could post my reply. The thing is that I have already logged-in to BF, otherwise I wouldn't be able to type my post. Does any of you had also this problem?