[Edit 2007/01/12 01:20:00pm]
Still no real word from Visi. I talked to a couple of other Visi customers and one is having the same trouble while the other isn't. I sent an email to support to make sure they were aware I was one of the people having the problem and sent another to support to let them know that their announcement page is publicly posting subscribe and unsubscribe requests which seems suboptimal. I got a very prompt response to the second message.