Over zealous ip address blacklist by the looks of it, it is like the thing some of us used to get when outside the country, one hotel where I stayed in Poland was blacklisted the other was always fine, only solution was to VPN to the UK to get a good address.
I have been trying to make a minor edit in Dave Cs thread and it has just happened again. Sometimes I get locked out of the forum.
I was using ZBBlock again as we had hundreds of visitors the other morning (and they weren't friendly), but I've disabled that now as it blocked far too many people.
Xenforo uses Ajax quite extensively - for example, when typing a post, the contents of the text box are regularly sent to the host and updates the currently saved draft (you may see "Draft saved" at the bottom-right of the text box which appears for a moment or two when data is sent). Ajax does not "HTML-ify" the data and this can cause problems for ZBBlock. There is a simple solution, edit the file "zbblock.ini" and change "ajax_optout = YES" to "ajax_optout = NO".
Yup, I wouldn't have been so concerned if it was my personal one as it's renewed by the ISP every few days.