Hi Mike,
I would like for you to clear up a few of things for me so I can understand your steps and try to guide you.
When you say you added 2 new 'tabs' to your Customer Center tab, do you mean tab links as in new screens that show up in the same line as Customer List, Invoices, Estimates etc,? Or do you mean tab sections on the Customer List screen such as Address Info, Additional Info etc? Did you first added those fields to the Customer table then drag and dropped them on to the screen(s)? Or did you just drag the textbox object from the objects list and dropped them on the screen(s)? If they are on new screens (tab links) then the Save button on the Address Info screen wouldn't work. I'll wait to hear from you.
If you would like a visual representation of tab links / sections please refer to our Method Home Page Quick Start Guide document by using the following link: http://www.methodintegration.com/web/self-service-documentation.aspx