I think this has to do with the fact that we are developing on a local machine and not on an actual server. I have seen multiple issues opened because of this error, but no one seems to want to resolve this issue at all. I resolved it by just uploading it to an actual server and working from there. Yes it’s more tedious, but until someone comes forward with how to fully resolve this issue on local machines, you’re stuck with that solution. For styling, I ended up doing the above, throwing in a lot of replies and topics, then dumped the html into a stand-alone html file. Then styled from there on the local machine and re-uploaded the css afterwards. It more than triples the time and work, but it works. If you have a client, just let them know that is the only way as for now. As for why you’re getting the error, I understand it that bbPress logs the ip from the user each creation of a topic/reply and does not recognize 127.0.0.1 or localhost as valid ip’s (which is what most MAMP/WAMP installs use). WordPress is fine with it, but not bbPress, or so I understand it.