We have also made another discovery....
Although whilst setting the ip and ports on the box's default ip (Not our usual method), we have been experiencing issues with Other HL based servers.
We run a portscan on the server and fouind that when running Brink instances, as well as running the ports set in the config, it also creates and opens a number of other ports which are not bound to an ip.
This is preventing other servers from being started.
We have been banging our heads against a wall with this one.There quite a few, the best way to see which is to run a port scan on the boxes you have brink on, try Currports (Brilliant little tool) - http://www.nirsoft.net/utils/cports.html
Basically until the ip/port binding is sorted out, Brink will cause some serious issues for us