Frontier's official representative on Facebook seems to be pretty responsive as well, I'd suggest posting something on their Fan Page wall, that would get their attention. Sounds like an amazingly annoying problem. Have you taken the usual steps to rule out that this isn't some sort of misconfiguration locally, such as using a different browser or a different computer? The error you sent sounds like something that's coming from the server side but it might be worth a shot just to check.