Maryland tax return issue - Taxable income and refund/owed amounts not calculating

I completed my Federal and Maryland returns using the Easy Step process. TurboTax is telling me my total Maryland tax is zero though this is not correct. Upon inspection (of Form 502) I notice there are no "calculated" entries in the "Deduction Method" or "Tax Computation" sections on the form, nor any resultant calculations, ie, Taxable Net Income is not calculated nor tax due on that amount (currently shows zero.) To make matters worse, I am not able to override the blank entry for deduction method to force the subsequent calculations. HELP!!!