You are using nginxcp in front of apache. When you re-compiled Apache earlier today, it will have deleted the RPAF module needed by apache to get the correct IP from the nginx proxy. You need to uninstall and re-install nginxcp to fix it.
indeed. i use an old 'new use notification' hack that sends a message and posts to thread everytime a new member joins. this 'bot' account always reports its ip as the same as the new member used when registering.