Ive found it easier to use a router with DHCP and just assign an IP to each one. Once I did that Cyber Cafe worked perfectly and my pc are always in the proper oreder on my screen and I assinged them in order from one to 25 like this:
Router 184.108.40.206 (default)
station one 192.168.0.101
three 192.168.0.103 etc.
And whenever I add a computer I go in and register the new mac address in the router or rename one if Im just replacing a machine.
I do all this from my laptop and Ive done the same with Netgear and dlink routers.
In windows I put them all under the same group name and in network properties I set it up to automatically obtain ip.
Ive used both CyberCafePro and TimerCafe using the same setup and have never had the problem since.