ADDENDUM:
You haven't said what form or topic is giving you the address problem and whether the form was imported or entered manually.
In addition to the info I mentioned above, if you have been trying all sorts of permutations to get it to work, and it's still not successful, I'd delete the form and enter it manually from scratch to see if that resets something.
Also, if you are trying to correct it in some "Fix It" error-check box, try navigating back to the original topic and correct it in the interview instead of that popup, or delete and re-enter as mentioned above.
