Saving a contact is triggering some dedupe code. Turn that off. It takes several minutes to save a contact, at which point a crazy notification tells you that a hundred other people have the same name as you.
Sadly, this "error" prevents me from saving the contact. I can't tell if there are more errors below the fold, because the scroll bar in the notification doesn't go all the way to the bottom.
There's a chance the failure is related to the custom nonnumeric phone number function (that should never be executed).