As an aside, there is definitely an issue in core-WoW where a following character will seem to lose sync with the main character and break follow on its own. I have dual-boxed for a long time with no software help, literally just following and hitting keys on both computers and this happens to me every once in a while. Its likely a lag issue and a packet gets dropped that causes follow to stop without the character getting a "stop moving" command back from the server.