So... I have been able to replicate across multiple browsers. In a group registration that has conditional fields and the email validator field, IF you allow your browser to autopopulate the fields, it will never move to the next member of your group. If you manually type the fields in then it works just fine. I say it explodes because in the latest version of Safari, it kills the browser half the time. In other browsers it will just sit on Member1. Auto populate on the biller page is just fine. Solution? only way around it is to create text fields and insert your own jquery.
So the autofill will work, but only after you click in the fields that have been autofilled. When you use the blast autofill, it populates the fields but you will notice there is not a check mark by them... there is some blur which requires you to actually click in the field to work... otherwise bad things happen. Injecting jquery to turn autopopulate off fixes this. Again.. seeing this in Chrome, FF, and Safari.