I am a new member, minutes old here and when introducing myself in the proper forum, all I saw for pages and pages were posts from 6phbbc.
One post from this hack was within a minute I had submitted my post. I say hack as this is most obvious when there are literately ten's of dozens of posts from this "user", none of which add to your forum.
I am a new entry into your community and I understand that maybe what I have to say doesn't add up to much; yet when I can see this obvious abuse of protocol, I have to share what I see with you.
I have not explored more of your forum, so I cannot say if this "user" is exploiting more. Just wanted to share with you what a newbie, less than an hour of use, can see without eyes to see.