InfoPath - Cannot Edit Data For New Fields - Infopath2010 Forms, InfoPath 2010

I have added new fields to the "main table" and created corresponding controls for data entry on the form. However, when I "run" the form so that I enter data, the control is "disabled" and I cannot enter data. Anything I am missing ? Is there more "procedures" for me to do to ensure that data can be entered. All previous fields are working ok, except the new ones.
Phillip