I failed to see what you're trying to share with me... Yes CloudFlare will operate as a front end on outdated versions, but UBB.threads versions prior to 7.6.1 will display the user IP address as the CloudFlare proxy address as opposed to the user's actual IP address which will result in all users having the same IP address... I know this for certain as I'm the one who built the feature into UBB.threads.
You can go ahead and take a gander at /libs/fetch_ip.inc.php, If you do not have one then UBB.threads will not read the pass-through IP address (user actual) and will instead log the proxy/relay address for all user activity.