I just looked at my return which I e-filed last month. I also used exception D under Part II. My "Tax Withheld Smart Worksheet" shows a zero in that blank second column. Are you sure the withholding you entered for Form 2210 purposes exactly equals the withholding you entered that was on your W-2's, 1099's, or any other income related forms? There is actually a small note on the 2210 withholding input screen that shows that total.
