Aq, I found the problem with Vellum. The auth cookie wasn't being accepted on my machine for some reason. Instead of sending vellumLogin I was getting Bugzilla_Login on the server. I think I might need to read a bit more about cookies, as I don't understand how deleting that Bugzilla cookie would allow the vellum cookie to store correctly. Ah well, at least I have a new toy to play with.