I use Sucuri's firewall.

I previously posted that all my users appeared to be originating from the same IP.

Gizmo suggested that I use this snippet in ubbthreads.php

Code
if(isset($_SERVER['HTTP_X_SUCURI_CLIENTIP']))
{
	$_SERVER["REMOTE_ADDR"] = $_SERVER['HTTP_X_SUCURI_CLIENTIP'];
}

It worked.

However, I've just realised that since the upgrade, my users are once again appearing to regsiter from the same IP

The new snippet below is taken from ubbthreads.php

Code
} elseif(isset($_SERVER["HTTP_X_SUCURI_CLIENTIP"])) {
	$user_ip = $_SERVER["HTTP_X_SUCURI_CLIENTIP"];
}

Any suggestions?