Finally came across this post too. Several "superuser" suggested deleting the form and using blanks instead of zero. Did all combination of deleting and re-entering the form and answering the questions differently too. Still have the same error, and this post confirms the error. For Jan-April, I paid the premium in full, so columns B and C are zero, but column A was 100%. Life change event occurred in May-Dec and a subsidy was given. Turbo Tax Deluxe repeatedly error out on Jan-April where I couldn't put zeros in columns B or C, nor would it take blanks.
