When the personal information form asked my Zip Code, I entered the complete Zip Code. The form responded that I had not entered a correct Zip Code. Well, I did, too. I suggest that the programmer instruct the form to accept either Zip Code as there are those who don't know or don't have to use the last four digits as those who get their mail at their postal box, but it should accept the complete or full Zip Code as it is correct ... not invalid.