figured out the efiling issue with the late estimated payment. 2018 tax due was $799. Didn't have to make estimated payments (under $1000?). 1st quarter 2019 paid $720. I guess the system may have known that if payments weren't required based on 2018 tax due, how could they be late? I just changed  the payment to 6/15/19. Error went away.

Thanks again for your help!!  

Bill